Until another plausible explanation can be found, I believe he certainly does not seem to be mentally imbalanced. On the contrary, he seems to be a very determined individual that wants to keep posting on specific subjects. He claims his motivation is purely to expose how casinos scam their customers (therefore he claims it is not a monetary issue on his part) but that cannot be corroborated.
It is difficult take him seriously when he gave the explanation for deleting his posts. Clearly, there is much more to that than meets the eye. Apart from smear campaigns, what else do you think are the
actual reasons behind his behaviour towards all of the casinos he regularly posts about?
Its not manipulation anymore because kingbj21 deleted 490 of their own posts, moving several threads to Archive. Before that, they were systematically bumping several of their threads in Scam Accusation about Stake, Duelbits & BetFury to make sure they stayed on the first page, even if all of them were 100% AI-generated nonsense. That was the manipulation part. Now that the flag is active, they are less inclined to attempt to smear these casinos in hopes of getting something from them for stopping. In essence, their grift has been halted.