My perspective on this is that it's about sustainability as opposed to trying to compete with big tech in a zero sum game. For example, Mastodon or Lemmy aren't able to compete with commercial platforms in terms of users, but that doesn't mean they're not viable communities. I can see a future where there's a niche open internet that exists independently of the commercial one and I think that would be fine. As long as there are enough people to do development on platforms and browsers and to produce content, that's all that really matters. In fact, a split might even be better because then we wouldn't have companies interfering with how the network operates.

There is no split if chrome works on everything and Firefox works on half of stuff.

Firefox just gets labelled as broken.