Mostly sports nowadays. I used to bet on casinos back then quite often since I wasn't into sports betting that much when I first started gambling, but recently I enjoyed watching eSports more compared to playing myself so I started delving into that. I still play casino games though much more rarely now compared to sports.
Wouldn't say so. It's just a personal preference really, I mean I reckon any kind/type of hobby a person has would never be a waste in their own opinion.
I think most sportsbook here are pretty trustworthy? I myself have used sportsbet.io, but you might want to spend some time reviewing them.