From my understanding of it, it would come down to whose PRNG software you are using and which evaluation tests it has passed.
In the main, the mathematical difficulty problems of a 'good' algorithm for a seed to pass through should make any results inherently undeterminable - in a well constructed PRNG the system itself is deterministic but individual values within it are not. This is a criteria of most standards tests, as well as the requirement that forward or backward sequence guessing is impossible.
(And gambling is only 1 application use; Security applications would need PRNGs where it's more important that previous numbers generated are not being able to be guessed - casinos only care about the future numbers, but a well constructed PRNG only passes standards once it proves that any future or previous state conditions cannot be guessed from a snapshot of current state conditions.)
I would expect professional casinos to be using the best PRNG available - nothing personal dude though in my opinion thinking it'll be used to decide who gets paid or not is conspiracy thinking; professional casinos make enough profit running legal operations and us punters are just faceless, nameless numbers to them - 5% get paid, 95% lose money; they couldn't care less who's on which side as long as someone is.
And the reason they'll use the best PRNG is because they themselves are the biggest targets if individual values & results suddenly become deterministic. Any casino worth it's salt lives and dies on results remaining random. And that's not just for players, that's for staff too - advantage using employees are a way, way bigger risk than advantage using punters.
Of course, over the coming years i wouldn't be surprised to see stories of casinos using poor quality PRNGs, though again i would more expect it to be that the casinos get taken for a ride by it more than the punter base is. It is an interesting topic indeed, and any PRNGs which are generating poor quality results can often remain undetected for a long time, so i would assume potential for casinos to be rinsed out is quite high too if they're not using 'good' programs.
