why do some crypto casinos have completely different game quality

Some of these crypto casinos really feel like night and day with the game quality. You ever load up a slot on one site and it runs smooth as silk with cool features, but try the “same” game on a different casino and it’s like pulling teeth - laggy spins, weird sound, not even close on graphics. It makes me wonder if they’re running on actual legit software or if there’s some knockoff stuff going on behind the curtain. I’m guessing licensing plays a part, but how can two places have such a difference if they claim to have the same game providers?

For the live tables, the difference is even more obvious. I’ve seen blackjack streams where the dealer moves in slow motion and the cards don’t show up right, versus others that almost feel like you’re in Vegas. Makes me nervous to deposit big anywhere new. Do casinos have different deals for better software, or are they cutting corners somewhere else? Any tips on spotting the legit ones without losing half your roll testing them?