Earlier quoted context omitted.
Adams has gone a bit nuts in recent years and has become quite a controversial figure. Like, Ive seen him in political flamewars on Twitter responding to criticism with pictures of his abs. He was a little weird for a long time, but his divorce in 2014 kind of unmoored him.
As far as I know, his “cancellation” stems from one thing, and one thing only: He says that Trump is skilled at being convincing (and explains how, at length). This, in the eyes of others, makes him a Trump apologist, and must therefore be shunned. If you had a link to that weird tweet I would like to see it; it would be interesting to see if I agree with your characterization.
In the wake of a shooting (can't remember which) he tried to push his WhenHub product as a journalism tool.
And his fence-sitting support of Trump has always been "now I'm no Trump fan but here's a long list of things Trump is good at and I'll be very defensive about criticism".
I was a huge Dilbert fan, so watching his decline sucks.