Have you watched sports recently? Gambling has always had a negative effect on the perceived fairness but once that effect becomes a core part of the way the sport is monetized it gets even worse for everyone involved. Watching playoff games last weekend either Draft Kings or Fan Duel showed an ad where a single person in a crowded bar is cheering wildly by themselves while looking at their parlay bet or whatever on their phone - this isolation of the communal experience alone is a definitely a negative effect but I could go on...