LoL has the esports aspect and Riot is careful about pay-to-win therefore, and keeps it interesting for competitions. It is indeed probably one of the least exploitative companies in that field. Its competition aspect is extremely addictive and easy to fall for though, and may ultimately leave you unsatisfied from thousands of repetitive gaming hours if you don't become engaged in real life esports / hobbyist communities in parallel. Not sure whether it is engineered to hook players so much though (Fortnite probably is).

With "Mario Kart multiplayer" I mean the experience of 4-player couch multiplayer, not online multiplayer.