can someone be be punished for bragging in all chat?

I would argue that it depends on the nature of the bragging. The more malicious the intent, the more it is worth the report.

Are we talking bragging about winning the local hotdog eating contest or what?

i duno riot is pretty vague on this in my opinion. in the tool tips loading into game, one suggests "reporting anyone who makes u feel uncomfortable". not exact phrasing but pretty close.

probably if they do it frequently enough to rack up reports.

Potentially, but why not keep all chat turned off in the first place? Nothing constructive comes from all chat and it's not necessary to win games.

Not blaming you, it sucks that people do that. I just think it's easier to disable them rather than deal with it.

yep because riot does not care. If they did they would remove taunts and mastery emojis and dancign and laughing and taunting because that is toxic as well as make ranked permachat restriction. people will argue over the emojis but hey they cant do it in lcs and the nfl players get fined and penalized for unsportsmanliek conduct and excessive celebration

I do not think they can be punished for saying they did well (and why don't you want them to be happy anyway?) But they can be punished if they are saying others in the game are bad.