Every gambling site has got its own edge. For different games the site has got different percentage as house edge.
They've based it according to how the business works each sites do different survey to know what's more competitive to attract gamblers to play using thier platform.
Reputable gambling sites won't make the edge get adjusted to the games for bigger earning.
They'll prefer to have a much lesser one to bring more gamblers to the site, one way of calling the attention of the players is HE.
I won't be checking every bet, because I used to go on for a series of bets.
It's your own decision and your own ways to determine the trust with the platform that you are using,.
Earlier it was little complicated to verify the provably fair functioning of the site. Now every site has made it much user friendly, so if there arises an issue I'll go verify for it rather than checking every bet.
Gambling house adjust to this feature giving and assurance to all gamblers that they can track the fairness in a much easier ways to make sure that the sites are willing to investigate if issues arises.