Slots are strictly regulated normally, and they are designed to take more then they give.
I don't think stake owners have the need to mess with the software, if you play long enough you will lose what you won.
But there are sites that mimic the big crypto casinos that host slots from well known providers like pragmatic and hacksaw but with altered software so you win more often.
To be able to withdraw you have to deposit 100 usdt first, which is obviously a scam.
I'm not sure I'm allowed to post links to those sites but beware of copycats with strange requirements like for example you gain levels only by depositing, not by wagering.
And having to deposit before you can withdraw is always a huge red flag also.