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 am hearing about gg.bet for the first time and I am going to check it out. I do believe that there are many of this Type of betting sites that we don't know there exist and some of them are really trustworthy.
If you are an avid fan of e-sports and you watch highlights and replays on youtube with your preferred e-sports. You will see a lot of sponsored videos from gg.bet and that will make you visit them because their video ad is catchy and looks interesting in the first place.
Actually a lot of sportsbook are there and they aren't just here in the forum but they are getting a reasonable amount of gamblers on their casino. Before it was D2L who's the most popular in Dota 2 AFAIK, they closed.