Why not? Some people are hacking on 30+ year old 8 bit systems... just for the fun of it.

Because they can

Because its fun, and because it might break the chromium monopoly we're currently living in, some day far in the future.

“Why not, because it’s fun, because they can”, These kind of answers kinda underline the question even more…

They do not.

Why aren't you building one in another language if that is something you feel is missing?

From GitHub.

> Ladybird is a truly independent web browser, using a novel engine based on web standards.

So I assume they want to build a truly independent web browser instead of leaving the Browser market to Google, Apple, and Firefox (relies heavily on Google ad revenue.) and executives that run them who are primarily motivated by money.

Why build from scratch?

If building from scratch, why do it in c++?

Because he wants to. C++ is used because 90% of all safety critical software is written in c++.