A Less Toxic Game
I've tested out other mobas, been to their forums, watched their youtube videos and a select few stand out in terms of vibes because of one feature.
No in-game cross team chat.
The mobas that don't allow communication with the enemy team have far less community issues and problems with toxic players.
Their logic is simple, there isn't a single reason at all your team needs to be able to communicate with the enemy team.
This isn't a suggestion or an idea I'm recommending for RIOT to embrace, I just think the more knowledge you have, the better.