In a lot of cases the people they detain might have several months or a year or more of procedure to get through, but they’d be allowed to stay after that, and in normal conditions they’d simply be let go and made to report to court for their proceedings. They’ve short circuited that process and now are just keeping people in detention while their cases are heard in immigration court. The goal here is to make people give up on their cases and choose to “self deport” by placing them in inhumane conditions. It’s why so many people have died in ICE custody, their detention is designed to be unhealthy and dangerous to increase the pressure.