The benefit of public oversight over free trade is accountability via due process. If you manufacture a hot dog and it's contaminated with something, or falsely advertised as kosher or halal, or doesn't meet any of a thousand little constraints in production, maintenance, delivery, and communication about the product, you are held accountable for violating the law.
Sex trade is different because of stigma and culture and prohibition. Stigma and culture have to change through education, activism, and time, but prohibition can be dealt with immediately. Create a robust framework of protections for sex work, protecting the rights of workers, and incorporate the industry into the existing legal system.
Getting rid of trafficking, pimps, and lack of recourse for workers and consumers negates far greater harms than any moral social corruption predicted by pearl clutchers.
The same applies to almost everything which society tries to cope with through prohibition. Black markets spawn second class dealers in vice, money and trade off book to the detriment of everyone except kingpins and corrupt agents of government and law enforcement. The vulnerable and desperate get locked into feedback loops of abuse and exploitation.
Legalizing all drugs and sex work almost completely eliminates the niches that perpetuate black markets. Forcing banks and legal jurisdictions to treat trade in vice equally to any other economic activity gives society the opportunity to treat drug abuse as a health issue. It enables sex workers to receive justice for abuse. It virtually eliminates the primary sources of income for cartels and kingpins. It forces culture to adapt, eventually allowing activists the opportunity to destigmatize responsible activities of adults in private.
We have laws that protect consumers and service providers, that give resource for violence and theft and fraud. It shouldn't matter what substance or sex act or hot dog brand was involved if a citizen is injured.
Adults have no business telling other adults what they can consume, or do in private. The business of government is behavior in public and in maintaining the rights of citizens in private.
We have ample and overwhelming evidence that prohibition always creates more harm than good, across thousands of years of history. It never works and always creates opportunities for abuse and horror. We also know that legalized vice results in more responsible use and less frequent consumption and fewer harms across the board.
It should be a no brainer. We should have responsible drug use education. We should have public sex work education.
Financial institutions crafting pseudo-moral gatekeeping policy from the whims of executives, pr departments, and Twitter outrage is a disgusting offense against society.