I got a bad impression about casino Stake
I lost 15 deposits without ever withdrawing money
Seems like you had a bad luck on Stake, not bad impression. Usually I take a break from a casino if I lose 5 to 6 deposits consecutively without being able to withdraw. It has happened with me several times on Stake.com. But you kept depositing and lost 15 deposits consecutively. Try to accept your losses and move on for a while.
Honestly, even though I am not sure how much money he is talking about. I would have stopped after the fourth deposit, to be honest. Or after I surpassed my budged, whatever happens first.
Also, bad luck and bad impression is different, in my opinion. You can have a bad impression of a casino without even gambling on them and because all kind of reasons: coin support, withdrawal fees, customer support, even the design of theme or the website.
Bad luck can be a constant in any casino, not matter the layout or their web, the games the have or how good it bad their support is. If you deposit on a casino be prepared for the losses.