Fedora is supported by Red Hat. And yes, I do think there is something to the fact that Red Hat is selling businesses commercial support for projects they have no expertise in, which probably means some of the pressure flows downwards from Red Hat's clients to the unpaid maintainers.

Arch, (Gentoo, Nix, Mint, etc.) have no commercial aspect on the other hand and certainly doesn't have the money, but those distros are offered on the same "as is" basis as the downstream software.