My theory (not substantiated in any provable way) is that:
1) there is an automated system recently implemented that suspends accounts that receive a set number of reports within a set period of time
2) jack's account is a constant target for reporting, specially by detractors of his platform
3) his account received a recently increase in attention thanks to all the news about his efforts to sanitize the twitter environment and turn it into a safer space
The combination of these three factors may have accidentally led to his account to be suspended.
As I said, there is nothing to substantiate this theory apart from flimsy speculation