I would almost certainly add an animal welfare charity to my charitable giving portfolio.
I previously had the Good Food Institute in the portfolio before financial challenges led me to trim it, so I might bring that back, or do some more research into the most effective animal welfare charity and add it alongside AMF and GiveDirectly as my primary contributions.
Given that it seems a solid majority of EAs on the forum seem to strongly favour animal welfare with very rigorous arguments for it, and my propensity to weigh "wisdom of crowds" majority opinion as evidence towards a given view, I'm actually leaning towards actually doing this.
The question of capacity seems unrelated to the crux to me. I'm pretty confident that if it were known that there was 100mn to spend then people would spin up orgs. I guess there is a question whether all those would be more effective on the margin than global health, but I dunno, it seems to be missing the bit that I care about most.
I think capacity is critically important.
The ability to "spin up orgs" is no joke, potentially even more so in the animal welfare space, where most orgs will be advocacy and policy based orgs and experience and connections are super important to actually be useful there.