There was at least one account "I_hold_it" that was banned in 2016, nobody was compensated. In 2018, joey made videos that showed some screenshots and data from another thread on here called "PLO Bots in Microstakes" and 3 accounts were banned from plo10 (with refunds given out).
Since the above 2 incidents, no accounts have been banned and a massive ring runs like clockwork with 2-4 bots on 75% of tables from 2/4 down.