tbh I thought Riot were super firm on this kind of thing.
But given that it can pretty much single handedly fix tier 2 it defo makes sense
As for the ethical implications, I'm sure Riot will 100% make sure that predatory advertising to minors is fully banned, especially when considering their previous stance on betting sponsors.
Even teams in tier 1 who aren't as popular will be potentially profitable now (popularity --> bundle sales)