You are contradicting yourself, or you have just changed your opinion for a reason? On March you said Stake is #1 sportsbook and now you say the opposite, what's wrong with you? If you have bad experience lately, why dont you share it with proofs?
Seeing how he is a legendary and he is not putting out a scam accusation or anything like that, the clear choice is that he probably lost some money here. I understand that it is not really something that I would be doing, just because you lost some money somewhere it is not logical to actually sit down and write bad about a place, you could be angry, but making your anger seen publicly is not a smart choice and as a legendary account owner he should know better.
But, this is also nothing too major neither, we all get angry, we all get upset when we lose big, it is totally understandable to see people be disappointed and then taking it out on others.