I think you should do a broader market research where you see the success and failure of competitors, just asking questions on that thread will not produce great results, for example look at what is happening with the signature campaigns on this forum that already they cannot last more than two weeks, which in my opinion must reflect a great competitiveness and perhaps the market is saturated.
to answer your question: I like sports betting
the question here is whether the market is saturated or not, I see for example the Dice game on many sites even on yobit there is a dice game