This is why there are places in the world that does it based on blockchain or some other provably fair method. This would allow those places to make sure that they are not involved and they can't be called scammers or something. Like lets assume that you make a lottery game, and then everyone buys tickets, you sell a million dollars worth of tickets, then someone wins that million dollars.
I’m always suggesting this kind of method on every casino giveaway but it’s very hard to change the norm on casino giveaways unless the majority brought up to the casino which is not the case.
Many user keeps participating on the current method of selecting winners that’s why casino never bother to change their mechanics.
We have bitcoindata.science created by @bitmover that casino can use to determine winner using the blockchain as example for innovation for a probably fair giveaways.
I believe you meant to say "provably fair" giveaways and not "probably fair" giveaways, and probably fair is not fair if you ask me.
Anyways, I agree with you, we are in a digital technology era, and online casinos are part, offspring and product of digital technology, as as much, it is their duty to innovate, by always trying out new and digital methods of doing things, and always going and staying with the best, casinos can't still do things traditionally even in the digital era, except such casino wants to be left behind since like we know, the digital world is advancing everyday and rapidly.
The bitcoindata.science is a very good tool used to determine winners of giveaways, lottery and so on using the blockchain as it's selection method, every casino should already know about this service and possibly use it, but then, it's unfornate that most platforms only stick to tools they are already used to, not minding whether or not, there are better tools out there.