What I have seen during the years (but it may be from before my fedi entry in 2018) in my perception there never was something you can describe as a "front against Mike".
I think what is more the case is that there are particular social dynamics at work in the fediverse developer ecosystem, whereby Mike's work didn't find the adoption it deserved, for a whole host of reasons determined by these dynamics. "Build it and they will come" is for instance a risky assumption, without advocacy.
More independent of what Mike does..
That what the fediverse is, and does, and can be.. It is all in the eye of the beholder. Each person has different interpretations and expectations. There's no consensus. But worse. Fediverse is seen as a pure technoverse, an open technology landscape to freely exploit.
In that light Mastodon is a platform, a product, a brand. Fully focused to be successful.. for Mastodon. Not for the fediverse per se.