I think esports and blockchain or bitcoin betting is going to explode, just the question is when. The overlap of demographics plus the growth seen in both makes for ann obvious and fruitful partnership down the road. A few have tried but I haven't seen anything that really took advantage of it yet. In terms os casinos et al there are a lot and a lot of review sites. Here's a list from more recently that looks like it actually tried the different brands out https://hodlhard.io/resources-and-reviews/bitcoin-gambling-sites/