Google Fonts lets you just download the font, right? So what's the problem with self-hosting them? They're not encrypted or anything. Like, I'm not sure what else you would want Google to do.
I have very recent -- like, 2 weeks ago -- successful experience of using these, since I wanted to distribute a WOFF2 as part of a browser extension.
[0] edited to add - you don't have to build it, you can get it from homebrew https://formulae.brew.sh/formula/woff2 or an Arch package https://archlinux.org/packages/extra/x86_64/woff2/ and presumably other distros