I trust, that the cards are dealt randomly on both GG Poker and any other well known site. The reason for this is, there has been no known cases of the cards not being dealt randomly ("rigged deck") in 25 years of online poker. And it would be extremely stupid of any site to do this, since they would almost certainly go out of business, if it was exposed.
I also trust, that my money is reasonably safe on GG Poker, simply because they are so big, that they are unlikely to go bankrupt and not be able to pay players back. This does not mean, I want to use them as a savings account though. Just like I do not want to use any other poker site as a savings account. Money kept on a poker site is for the games, one play there, and nothing else.
However I dont trust, that GG Poker has the best security in the business. As others have said, they had a super user scandal, where someone had hacked into their software, which is basically the first time, this has happened since the "Potripper" scandal 20 years ago. And I also dont think, they have the most customer friendly policies.
But the main reason, why I dont play there much, is because the game selection and offers of PokerStars and ACR Poker simply suit me better. So while I have had an account on GG Poker since june 2026, I still find myself preferring to log on to either PokerStars or ACR Poker the vast majority of the time. I might even withdraw my funds from GG Poker soon, since I have not played there for almost a month at this point.
The main issue for me about GG Poker is their selection of SnGs, which are all hyper turbo lottery style games with a very high rake. I tried the Battle Royal a bit, but I prefer the traditional SnGs of the other sites, and I also lost 30 BIs in a fairly short amount of time. Which might just be variance, but its still not a great motivation to continue playing that particular game, when the structure is bad and the rake very high.