I don’t know about his website’s bankroll why he isn’t filling the hot wallet but people aren’t forced to play there.
I don’t think it’s a case of untrustworthy behaviour but of carelessness.
If someone owes me money and ignores me, I consider him untrustworthy. I know the feeling of having to wait for (significant) amounts of money, as it happened IRL. It may not be a concern to the person who has to pay, but waiting for your money and not knowing if you're getting scammed just feels bad.