Totally not insane if you ask me. Security incidents can happen to anyone. The incident response matters and I think in this case those unpaid volunteers did an excellent job.
"at PhpStorm, we are fans of Nikita’s work. We always supported the Open Source, and this felt like a new opportunity – so here we are! Nikita will continue contributing awesome features to PHP, and together we will experiment on what is possible in the realm of language tooling."
~ https://blog.jetbrains.com/phpstorm/2019/01/nikita-popov-joi...
I am personally not qualified to do infrastructure maintenance, knowing next to nothing on the topic.
It's also often the case that those unpaid volunteers have a day job related to the projects they volunteer in, so there is some direct or indirect financial support. It seems reasonable to assume a large part of open-source software and infrastructure is maintained by people having vested interests in it.
And the idea that there is some mischief- or accident-proof alternative is, I'd argue, equally nutty.