I know some unofficial viewers have the ability to block ad-hoc temporary group chats entirely but that is not what I am proposing. What I am suggesting is that no one should be able to add anyone to an ad-hoc group chat by a person that has them blocked. Doing so would leave ad-hoc group chat functionality enabled for everyone else you know but disable blocked individuals from initially adding you to theirs.

If you have someone blocked right now they can add you to one of these ad-hoc groups and instead of the group IM opening from their initial text the next person to speak forces it open for you. People have exploited this to make tons of these groups just adding or removing a few people and starting a new one which essentially they can open infinite group chats for someone as a means of harassment and using others reactions to troll a person even if they themselves are blocked. This can range from being a bit of a nuisance to the level of entirely flooding someone with these.

There is a lot of things someone who is blocked can do to the person that blocked them still that surprisingly have been allowed to persist for over a decade and this is one of them I think should not be possible. This isn't a proposal to get rid of the feature entirely, just disable the ability for a blocked person to add you to one of those.