I mean if I was just put on a flight back (for a tweet they found on my phone or such), that'd be kind of bearable. At least one visitor from the UK got locked up in a facility for a week.
If you're talking about Rebecca Burke, it was almost three weeks. All for something that was at worst a naive understanding of the visa she needed.
https://www.independent.co.uk/travel/news-and-advice/rebecca...
https://www.sportskeeda.com/mma/news-update-u-s-federal-pris...
"UPDATE: I just spoke with coach Renato Subotic for a few minutes. He says he was detained at FDC Honolulu, which is a federal prison facility. He says he has no criminal record and it was a simple visa application issue. Interview later this week."
No one wants to be detained.
People who are spending thousands and tens of thousands of dollars to travel are fine if they need to spend a few hundreds additional ro fly back and cancel their vacation. Or sucks but it’s in the realm of the risks you take with international travel.
However, being detained, even for 1 day, and treated like a criminal is something none of these folks want.
Not gonna happen this year, probably the next 3 years or more.