Berlin — IMMIGRATION and Customs Enforcement calls the detention site in Dilley, Tex., a “family residential center.” But to the 2,000 migrant children and mothers who live there, it’s something else: “People who say this is not a prison are lying,” Yancy Maricela Mejia Guerra, a detainee from Central America, told Fusion last year. “It’s a prison for us and a prison for our children, but none of us are criminals.”

The Dilley center holds people detained by Immigration and Customs Enforcement, a government agency, but it is run by the Corrections Corporation of America, America’s largest private prison and detention company. It is one part of a worrisome global trend of warehousing immigrants and asylum seekers at remote sites maintained by for-profit corporations. The United Nations estimates that one in every 122 people on the planet is displaced. This is a crisis that requires a humanitarian solution; unfortunately, some people view it as a business opportunity.

In recent decades, many Western governments have increasingly outsourced prisons to private companies, claiming that doing so saves money. As the number of migrants and asylum seekers has grown, governments have found a new use for the private-prison model.

It has become a multimillion-dollar industry. The company Hero Norway runs 90 refugee centers in Norway and 10 in Sweden, charging governments $31 to $75 per refugee per night. Australia’s government has contracted the company Broadspectrum to manage two detention camps in Nauru and Papua New Guinea for asylum seekers. In Britain, Prime Minister David Cameron’s government awarded the security firm Serco a seven-year contract in 2014 worth over $100 million for running the Yarl’s Wood immigrant detention center.

These private companies are too often plagued by scandal and accused of abuse. The Corrections Corporation of America has a long history of ignoring detainee safety and federal laws. Serco has been accused of inadequately training its guards and overcharging the British governmentfor substandard work. One doctor who worked at a site run by Broadspectrum in Nauru told The Guardian that the detention center was “reminiscent of Guantánamo Bay.”

The global flows of refugees are unlikely to abate anytime soon. Wars in the Middle East continue, as does the epidemic of gang violence in Central America. Climate change will send millions more people fleeing their homes in the years to come. Governments must accept that for-profit detention centers are not the way to deal with this issue.

State-run detention centers don’t necessarily guarantee more respect for human rights, but there is evidence that government control brings improvements: A 2014 report by the American Civil Liberties Union, for example, found that private immigration detention centers in the United States were more crowded than state-run ones, and detainees in them had less access to educational programs and quality medical care. And public centers, while still flawed, are more transparent

Opacity is a common denominator in the privatized detention system around the world. In Australia, Europe and the United States, journalists have less access to private prisons than they do to public ones; governments maintain less oversight. That’s not a coincidence. As Matthew J. Gibney, a political scientist at Oxford University, told The New York Times: “When something goes wrong — a death, an escape — the government can blame it on a kind of market failure instead of an accountability failure.”

Advocates of private immigration detention claim they are saving taxpayers money. But that seems unlikely. The American government spends more on immigrant detention today than it did 10 years ago, when the number of border crossings was higher. The Corrections Corporation of America and other companies have lobbied politicians to keep more people behind bars rather than deporting them. Congress requires that at least 34,000 people be housed daily in detention centers — a so-called detention bed mandate.

Making a profit doesn’t just require keeping beds filled, it can often lead companies to skimp on services. This means mental health care, outdoor activities and healthy food are far less available in private detention centers than at those run by the government. Last year, the United Nations described a camp for refugees in Traiskirchen, Austria, that is run by the Swiss firm ORS Service, as “inhumane” because of overcrowding. Similar reports are common not just on Europe’s frontiers but across the world.

Governments that receive migrants and asylum seekers must reverse their reliance on private companies. The current practice is a short-term fix that in the long run will cost governments more and subject refugees to worse conditions. In the meantime, governments from Canberra to Vienna to Washington should institute independent cost analyses to ensure that private centers give taxpayers the best value for their money. They should encourage more oversight of these sites, from government agencies and from the news media. And the 34,000-bed quota must also be done away with immediately.

In its 2014 annual report, the Corrections Corporation of America worried that changes to American immigration policy could cut into the company’s bottom line. Many other such contractors might have similar fears. Let’s hope they do. Unless governments make drastic changes now, these corporations look likely to get richer and richer as more people around the world flee their homes, desperately seeking safety.