People make new distros based on existing distros to alter the software stack in the original distro. Gentoo allows you to use essentially whatever software stack you feel like, it’s less of a traditional distro and more of a general-purpose Linux package manager and dependency resolver. It’s not very opinionated at all.
I mean, the correct answer is just to pirate it, but you could probably fool it into thinking you’re on windows by changing the user agent string of your browser to Chrome Windows x86_64