There are truly users who are like that, that even if there are plenty of great and highly reputable casinos, they still choose the ones who are the opposite of that. One reason that I can think of, is that they are not totally active here in the forum like us, specifically in this section (gambling). If you will also hangout mostly outside, you will be surprised that a big number of casinos which are unknown to us here are being advertised.
Anyways, as the OP stated, he is a long-time player of this site, and that is why he trusted them. Then if we read the negative feedbacks they are receiving, it only came from users who abused their platform. I can believe on that, I mean I did try 8bet.io before and I have withdrawn smoothly a couple of times here. OP haven't been scammed either, but it's just that there are only a new/few changes made on their withdrawals. He can still withdraw all of his money slowly and decide if he will still continue playing on here or not.