It's a problem for the entire ecosystem that the most expedient thing to do, the thing that we should have sympathy for them picking under a time of stress, is the thing that relies on people who want to communicate with them having a Google account and having that communication intermediated through Google with no alternative. And since the entire point of Shipyard as an organization is to be stewards of the decentralized web software ecosystem, the fact that they're not using decentralized web tech is relevant to their mission and values.
I could (sort of) see why you might get this upset if people were required to have a Google account themselves to submit this Google form, but that's not the case. Who are you to tell an underfunded opensource dev company that just lost their biggest project what tools they should use? That email you hypothetically sent will probably get delivered to an account in their Google Workspace, how on earth is that any different?
I've run into a lot of Google forms for projects that do in fact require me to log in with a Google account in order to submit, which I think might be related to Google detecting that I'm using a VPN and treating the submission as higher-risk. I just have this reflexive assumption that if something is presenting me with a Google form, it's not gonna work unless I log into a Google account on my local machine. Which is ultimately the reason I care about this kind of thing.
It's not their job to cater to your nitpicking. Even if this Google form didn't work over a VPN (which it totally does), you're capable of turning the VPN off if you really want to submit feedback. But it doesn't even sound like you have any feedback, so what's your problem?
I think it's a perfectly valid complaint about the ecosystem at large. Not a criticism of the individuals or of this specific case to be clear, but a broader observation that this isn't how things ought to be according to a certain set of ideals and the question then of why we keep seeing it over and over. Clearly there's some sort of systemic shortcoming that applies to the entire ecosystem.