While I find the idea of a prison a bit silly, the 10 day courses come with a heavy load of tradition, more or less mandatory 1hour talk everyday, and at least 2-" h of mandatory (in the hall together) meditation practice.
I am grateful for what I felt on those 10 days. But in a sense, I got more than I asked for. So those 10 days are a little bit sneaky in a sense. There is a lot going on those retreats, a lot of energy work. But once you're out of the retreat you're on your own.
While the 10 days have their benefits, I think there is a place for a distraction free environment that lets people think about their life without putting them on the "awakening" bus.
As an aside, I get the idea of the prison. The idea is to be submissive, to lose control. It's a very common theme in sexual fantasies as well, for a reason...
But, at the very least if they're going for the prison theme it should be cheaper than 90 USD a day. :/
An example near Chiang Mai in north west Thailand https://www.fivethousandyears.org/
I've done two 10-day courses from them. After my first one I described it to people as like being in prison, never having gone to prison, but with less freedom than prison. But I still went back for a second time :)