Giving and not giving casinos online
Let's start with the fact that everything you see on any normal legal casino site (such as PariMatch) - slot machines, roulette, card games and other software - it all does not belong to these very casinos. The casino site is sort of an aggregator of various gambling games. Like if you go to the AppStore or Google Play and see a lot of different applications in front of you, they also don't belong to Apple or Google respectively, all the applications inside are developed by other IT companies.
So it's exactly the same with online casino software. They are developed by individual companies such as NetEnt, Microgaming, Endorfina, Playtech, etc. Representatives of the casino agrees with these manufacturers (providers) to place their software on their site. Casino receives new slot machines, roulette, etc., and pays for this money to the provider (the percentage of bets made).
Provider, in turn, guarantees a certain mathematical expectation of their games - the casino must always be in a small plus. Slot machines usually have a 94-98%. Ie. At a long distance of a million bets, for example, the casino will receive the remaining 2-6%. At a short distance, such as a hundred bets, it may be different - the casino can even go into a large or small minus. But over time - everything will come to these figures and the casino will always be in the black. The main thing that the players were a lot. Ie The more players play in the casino, the more likely that the casino will get those same 2-6%.
This expectation is laid gaming software manufacturers in the development of their games, their software is checked for compliance with the declared numbers of organizations that issue licenses such as ...
All the calculations take place on the servers of the software manufacturers and only they have access to the servers. It is their intellectual property after all.