The proof is watching Live or Actual RTP on Blackjack. It's far, far lower than expected RTP thanks to people who just insist on hitting on hard 20, for example.
I am ashamed to say that I rarely check the house edge and RTP amounts whenever I gamble. Yes I know, I should check them and I should know them and I should not be getting scammed in some place that has way more than what they are suggesting because that could potentially happen. However what I do not care about is the ones around here, Stake and there are few more other places that we all know and we all love, and you and I both write on the topic of as well, I have seen you there too, so a few places, max 5 places let's say. In those places I know that they are legit and not after scamming me and I know that it is not going to be long until someone figures out if they do something wrong. So I just look to enjoy myself, nothing more.
Nah, nothing to be ashamed of. It's not
really important if you're just a casual gambler looking to have fun. I know some slots, for example, have very high house edge but people like them more for the big Jackpots. Same as some roulette tables, higher house edge than others but maybe people prefer the energy.
What's more important is to self-verify Provably Fair games (where possible) and RNG certifications for providers who don't have Provably Fair mechanisms you can self verify. Almost a duty to see for yourself they are as fair as they claim.
And yeah, we're both playing at the same places with almost the same providers -- for games I always prefer Provably Fair dice (or equivalent) and for sports, I just go for best value and entertainment =)