I would also like a comprehensive list of prior enforcement actions.
FinCEN has this, https://www.fincen.gov/news-room/enforcement-actions
If that's really all they've done, it's been quite rare.
In Eric Powers' case (2019), they seized all his data, fined him $35k, and forced him to sign an agreement that he wouldn't act as an MSB again. Sounds like they thought a jury would be sympathetic, and so they couldn't go for much in a plea bargain. They list only two other MSB enforcement actions since then.