I fund you folks on Liberapay so you've already got my $10/mo (and much more) without the other overhead of taking care of my messaging service. I also self-host so am not going to use Librem.one anyway[+]. However...
> old infra surrounding the matrix.org server had grown organically and hadn't received any proper ops love
I'm sorry to be a bit harsh, but "hosting package and android signing keys on production servers" and "not putting services on an internal network accessible only by VPN" aren't small mistakes. They're major screw-ups. An "organically grown" setup where the signing keys were on one developer's laptop would've arguably been more secure than the old setup.
Don't get me wrong, I really want you to do well (I've used Matrix for years and have donated >£1500 over that time). But I have to be honest with you that trust in your infrastructure is going to be very hard to get back. Hell, it took until last week for some of the remaining services from the breach to be back up (fedtester was down last week from memory)!
The offer for hosting matrix.org packages on OBS is still open. It'd reduce at least a bit of maintenance overhead and would at least allow homeserver operators to get the latest packages independently of the main matrix.org infra. :D
> and was set up by a professional ops team
Given that the ops team is presumably employed by New Vector, why wasn't the matrix.org infrastructure fixed before launching a new product? Was this something that was planned to happen but never did, or was the long-term plan to shut off matrix.org and get everyone to switch to Modular?
[+] Though I'm surprised that you seem to see public offerings of Matrix homeservers to be a negative rather than a success of the protocol -- surely this plan was obvious given the Librem 5 wanting to use Matrix as the main messaging service. Obviously I think they should contribute back to Matrix.org, but isn't focusing on that missing the wood for the trees? Also the main benefit people will have out of a service like Librem.one is that you are paying for all of the services provided, not just one. I have a feeling selling "just another chat system" to folks (which is what most people think when they first see Matrix) will be much harder than selling "G-suite that protects your privacy".