That helps in some cases, but google would still know what font was requested and when. So if a certain site uses Noto Sans and Montserrat that narrows down whi

That helps in some cases, but google would still know what font was requested and when. So if a certain site uses Noto Sans and Montserrat that narrows down which site you visited to ones that use those two. Considering google regularly crawls the whole web it definitely knows which sites match those two. That would be a pretty big group of sites, but the more sites that use the features that google fonts touts as performance gains like subsetting and the display parameter the more tracking bits google gains. The more fonts and options sites use the more unique the request signature becomes. Basically if you don't want to be tracked the only good way is to not request anything from the tracking companies. As soon as your browser connects to them they have gained something. Use uMatrix to block all third parties by default, and only whitelist what is absolutely critical for the site to work.