The PSA is that you should always have a mirror—even if just a bare repo folks can pull from during downtime.

…& this is ignoring all the moral reason for avoiding US-based, publicly-traded, proprietary software for host largely free software. They also deny access to users due to US sanctions, privacy-conscious users won’t want to create accounts/agree to ToS, & rubbing shoulders with other corpos your project can be taken down if it upsets the corpos don’t like it (see youtube-dl, Switch emulators, etc.).

Sure, but it's not just the reoo. It's PR's, code review and you've got a bunch of actions then it's difficult (not impossible) to deal with those being down.