I tried to be careful with a caveat, but you're not wrong. I think it's a good thing to chase and I hope Mozilla makes a stable long term commitment to it and doesn't expect instant results.

re: youtube, I really think it's a place where the fediverse is needed the most, and is unfortunately the weakest. I have seriously been considering something like an outreach campaign for niche categories just to build up the fediverse video universe (e.g. asking bands if they are okay with their live show videos being mirrored to fediverse, educational content, and maybe even something like a fediverse friday). Maybe a convo for another time but I think it's a huge issue where, unlike the browser wars, there's not even an obvious second best option.