Ladybird exists and is funded because the main author is an extremely skilled software developer with a background in building web browsers.

He also built a totally from scratch operating system, and built a very productive and skilled community around it, which branched into building their own web browser as SerenityOS has an 'everything from scratch' policy. How is Serenity not an interesting feat of engineering?

You seem to call it a 'toy' because of where the development is at - this is grossly unfair criticism. By your measure, is all software that isn't at a 100% finished state a toy?