Good question! By and large, some of the following would count as a "strike":
Poor moderation
Excessive spam
Most importantly: Making non-backwards compatible changes to the ActivityPub specification that may lead to the classic "Embrace, extend, extinguish" situation
Kbin.cafe on Blocking Meta's New Threads App ( kbin.cafe )
For those who aren't aware, Kbin Cafe is a Kbin instance I run. Cross-posting our stance on Threads for visibility....