Most gamblers don't check the provable fairness of their games especially if they are playing on a reputable site.
It is like we already trust them enough regarding this important feature. But it is still best if you check this from time to time.
Just to make sure everything is in place. And this kind of service is great as they can make our jobs much easier.
On another note, I was surprised, they don't have the sportsbet verifier yet, which is actually the go-to of a lot of sportsbettors here.
Because they are not developers, coders and don't learn to verify the provably fairness of casino. However having the provably fair for a casino is a condition to bring more trust for one casino.
It is a similar condition like open source code. Not all of us can test open source code but experts can and if they test and did not find harmful threats, suspicious things, we can believe in community verification. There are casino reviews and provably fair verifiers, if they and community don't detect cheat from casinos, I think those casinos can be considered to use.
It is better if you learn to use verifier and do verify by yourself.
That is why sites like this one provablyfair.me are great because you can use it to verify your bets and its very simple compared to coding you would need to do to verify on your own.