Riot, can you make it so AT LEAST, we can't drop off a tier if we lose a game with an AFK in it?

The problem is that people will abuse the system. If they are about to drop, they'll duo with a friend. If they will win then nothing will happen, but if it looks like a loss then the friend will afk for the amount of time needed for a "drop prevented"

I also think riot needs some way to protect players who are in games with an afk, the problem is how to do that without encouraging the behavior of trying to bully someone into afking in a loosing game.

why? that's basically the same thing as loss prevent

Probably not, there have been a million threads about this (I made one of them) and Riot doesn't even bother to respond

Chances are if it's something that people are toxic about, Riot's already thought about it and there's USUALLY a reason why it doesn't exist.