AFKing at the fountain because you think the game is over.

Duh. There's no difference between a guy trying to AFK in-game, and a guy who AFKs a game by hitting Escape-Quit.

Is AFK bannable?

Yes? There you go.

It is punishable, however I'm pretty sure it would be more likely to be caught by Leaverbuster, which doesn't ban (afaik) but rather issues a 5, 10, or 20 minute wait time before entering queue for 5 games.

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Is that bannable?

Yes it is, and honestly its worse than feeding to me but being reported and going on a tilt feeding playing really badly seems to be also ban worthy too waiting to see what Riot says in my ticket but yeah seems that way too so either way play and feed you can get banned it seems, or rage /afk and get banned.

Going AFK though is the worst possible thing you can do though because IMO over years of playing you can learn a lot of things even if you play very badly especially with all the new season changes.

Also just ignore the toxic comments people make towards you and try to play the game its the only way I can keep from going afk myself is mute and play the game even if I do bad.

My guess is that if it is a frequent issue, yes, Riot will respond. One time? I doubt it.