@Oscar Sykes Can I check for a source/reference to hire for lots of EA orgs saying they struggle to hire for ops, marketing and comms roles? As @SiobhanBall said, lots of people apply for these roles. Is it that the candidates aren't good enough or have higher salary expectations? That there are lots of applicants to some EA org but not others? That some orgs are willing to pay higher salaries than others? Geographical differences, e.g. higher pay in the US compared to for example the UK?
YC does have a nonprofit program: https://www.ycombinator.com/nonprofits/
List of nonprofits YC have invested in, including 80,000 Hours: https://www.ycombinator.com/companies?nonprofit=true
I can also envisage an "America Talks AI" version if the UK route isn't the right one, built on More in Common's US Hidden Tribes segments and that could launch through an existential-risk incubator with a strong US presence.