My gut feel is that Micay is genuine, and obviously also very defensive.
At least some of the defensiveness is warranted. Maybe most of it. Regardless, it comes across in most GrapheneOS communications, and it's sometimes counterproductive.
A related issue, which I'm sure Micay can appreciate, is that users of GrapheneOS tend to be cautious, and increasingly will want to know why the project should be trusted, now that it is popular and on a lot of radars of adversaries.
(For example, hypothetical scenario that's plausible, given the incentives: State actor (e.g., RU, US, CN) or organized crime group long-con starts with a public harassment campaign of Micay. Followed by sleeper volunteers taking more control of the project, initially under the pretext of helping insulate Micay from harassment, and taking some of the load off. Later maybe even impersonating Micay. Now the threat actor has backdoors to a large number of especially privacy/security-conscious parties, including communications, 2FA, location, cryptocurrency wallets, internal networks where those people work, etc.)
I think it probably hasn't been compromised like that, but it's an obvious real possibility, and IMHO, until GrapheneOS is more transparent, some natural users of GrapheneOS are going to consider iPhone relatively "the devil you know".
Again, I think Micay is genuine, and I'm a fan of the project and appreciate it. And I hope the project understands that's compatible with critical thinking about infosec, and doesn't take personal offense at that.
(Source: Am long-time GrapheneOS user, and have donated.)