from which interesting derivatives will show up.
I don't think that will happen and hope it won't because NixOS can handle the usual preferences people might have internally.
Don't like glibc? pkgsMusl is the entire package set but with musl instead of glibc.
Want static compilation? pkgsStatic.
Afraid of systemd? Well okay, we don't have that right now but I don't think anyone would be opposed to optional support for worse service managers. It'd just be an opt-in toggle that we could support with enough people interested in it.
That'd be news to me and an ad hoc comparison I just did shows results much closer to Google than Bing with results usually just locally having switched places while on Bing it's an entirely different order.
They do(did?) use Bing for mobile search results because daddy Google forced them to not be competitive on the platform they're most interested in.