I am playing in the last casino I have an account which won't be long after this happening,
Many people say that, but eventually they go back to gambling.

it shows that all casinos are really cheating heavily
Something that has become a universally accepted norm can't be called cheating.

as you cannot really have 22 lost buy bonuses and just 2 wins, not as criminal as 29 loses with 0 wins still very close to it.
Well,
the God of Randomness can be merciless and cruel to us at times.

That was Stake, now it is Shuffle, this was even worse
I don't see any fundamental difference between various casinos, since the same providers supply all the games and the odds of winning are the same everywhere. That is, of course, assuming the casino doesn't have the ability to alter the RTP - though I certainly have my doubts about that.
By the way, a slightly off-topic question: are games created by providers audited to ensure they match the stated RTP?
as it kept massively drowning all my money in the fastest way possible, just 10 minutes almost 100 dollars gone in an instant.
Well, you can burn through a deposit very quickly in slots, since the only required action is pressing the "spin" button. Perhaps you should have placed fewer bets and selected fewer paylines to play more cautiously?
What is wrong with these people,
It’s a casino, baby.

Or did you hope to easily walk away with the winnings?
I still believe no one audits them,
I’d also like to get to the bottom of this and find out whether casino games (slots) actually undergo audits at all.
I know I am the absolute idiot who keeps playing such things.
Because we delude ourselves with the hope of victory.
Most likely I will close my account there too and start a calm and happy life.
But can you do it? How long?