> For example Signal didn't have a way for a group to boot out a member against their will. This article says just as much. Sure, you could brute force a 128 b

> For example Signal didn't have a way for a group to boot out a member against their will. This article says just as much. Sure, you could brute force a 128 bit key to get into a random group. And if you were kicked out of a group, you could re-add yourself if you had saved the group key. But even the article says it's not super likely.