As I often play dota2 or watch dota2 videos on youtube, I've become more familiar with an e-sport and sport bet site, it's
https://gg.bet/ and it became more popular among dota2 players. To be honest I haven't ever try it but I thought they are trustworthy as they usually become a sponsor on e-sport tournaments and also accept Bitcoin to bet.
I also watch Dota 2 videos on youtube and gg.bet is popular and very active in advertising through all of those videos. They have a lot of games to bet with but they became popular with e-sports. I don't bet with them because I'm into other popular sportsbook site here in the forum. But if I have a list of reputed sportsbook, I'm including gg.bet.