I didn't say anything about usefulness. Even a bunch of dotfiles can be useful, Oh My Zsh and others were very popular after all.

The thing I complain about are that these companies that build their fortunes partially on open source benefitted a lot from systematically underfunded developers. But they only make small contributions to those projects (if at all). But if their millionaire buddy shows up, they all stand in line to donate millions.

I am not sure what it is. I guess partially they want to associate with the popularity of Omarchy, partially they are doing a favor to another rich techbro, some may agree with DHH's politics to 'drive woke out of open source'. But it still sucks that they don't give that many millions to Debian/OpenSSL/LibreSSL/Rust/pick your other favorite infrastructure project that they highly depend on to make their money.