If you abandon 2 ranked games you get put into the low priority queue and have to play a certain number (at least 5 I think) of all-random games that don't record anything.
If you get reported for communications abuse enough you get a communications ban and can only use the chat wheel and rate-limited pings. Other reports get turned into low-priority queue time (supposedly).
If you dodge a game (even if you don't ready up) you get progressively harsher queue timeouts. It goes something like 4 min, 10 min, 30 min, 1 hour, etc.
There is also rumor of a hidden queue pool of toxic players. Kinda like a shadow ban but it lumps all the ragers and dodgers and AFKers and feeders together to play with each other.
Honestly, LoL never appealed to me. Every champ is about the same with about the same skillset and every game has the same laning. Riot seems to not really be able to make changes and their community management is bad.
If you can get past the turn rate and inability to spam spells in Dota you might enjoy Dota more.
