I just wish they had not acquired Screen Hero. That was a beautiful standalone product that I wish I could still use.
It would be common for an acquisition agreement to shackle the founders with non-competes. It would also be common for those non-compete clauses to have limited durations. (I have seen 2-3 years in documents.)
Slack bought ScreenHero over 4 years ago. The non-competes have likely expired.