Browsers have been historically the biggest and most difficult projects, so hard to say why it wouldn’t be. When they can start promising 20k bounties for segfaults, they are getting close.
And how could ladybird attract so many sponsors for such a project? Why wouldn't they fund Firefox instead if they want to achieve some diversity in browser engine field?
I'm curious, not skeptical.
That's just a tired thrope that keeps being repeated by people who don't know any better.
I tried it on my m4, it's surprisedly usable.