It's slightly more involved than this, but not extraordinarily so.
For example seemingly innocuous implementations like loading fonts directly off Google Fonts without consent (i.e. providing Google with information about visitors' browsing habits) would technically be on the wrong side of the GDPR, but I think it's very unlikely that anyone would complain about it, legally speaking.
For example seemingly innocuous implementations like loading fonts directly off Google Fonts without consent (i.e. providing Google with information about visitors' browsing habits) would technically be on the wrong side of the GDPR, but I think it's very unlikely that anyone would complain about it, legally speaking.