Users: it’s a good idea to block all third-party fonts so you’re not leaking data (filter rule: *$font,third-party). Unlike scripts/styles, fonts generally don’t hurt the UX (unless a developer is using icon font which haven’t been best practice in a decade--which is ironic considering this blog is broken).
Developers: vendor these Google Fonts (most are licensed SIL) as other have noted in this thread & host them first-party for the benefit of your users. If the cost (hosting or performance) is too much to host the fonts, consider using less fonts because users are still paying for the bandwidth. (I am still pro-web fonts, as they can be in improvement on the UX, just be smart about it).