It saddens me to see the communities surrounding free software projects going dark because of the threat posed by AI tools, but I don't know what other solutions there are that would mitigate the threat, particularly when browsers are such a compelling target. Perhaps some kind of trust system a la arxiv.org, where existing users have to vouch for new submissions before a user is themselves trusted? Definitely still vulnerable to abuse, but perhaps less so.
Closed-source projects have been dealing with this forever, by having a mostly-static pool of employees replenished through job listings and interviews. A FLOSS project adopting this model would certainly feel weird, but could work if there were enough willing candidates. The question is, who will take on effectively a job without the monetary reward?
My understanding is that the people working on ladybird are compensated for their full time positions, so I would also expect any future positions to be similar.
