Group blame and reports don't mean anything if you haven't done anything actually wrong. 1 report is the same as 9.
The thing is, any criticism, any joke or snarky comment, arguing, complaining, talking too much, wanting to end the game, mentioning that you will report someone or actual flaming is deemed worthy of a ban by this board. And that's not hyperbole, that's how this board feels through various posts. We're in a situation so grave here that anything but complete over the top 100% positivity is ban worthy. This isn't realistic and this isn't even possible. If bans were applied to real life like they are by various members of this board, I would be banned from talking to every one of my family members, coworkers and friends and pretty much every company ever.
We also know Riot goes back multiple games to justify bans and the deeper they look, the better chance they have of finding something. We have no idea if there are any rules for this process either, so people could be punished in theory for things said 50 games ago.