Better to just harass them into a habit of dismissing the banner.
They don't seem to call it GPC, but their "ask websites not to track" feature now uses it instead of GPC.
if you write to your reps, they might just change that. The Eu is one of the few democracies left. Slow but powered by the people
The exact definition of "legitimate purpose" is unspecific (which is important to be able to adapt to development of new services) which leads to some lawyers being careful.
I also claim that some lobby groups promote having too many and too big consent banners to move blame from tracking companies to the EU ("stupid EU forcing all those banners!") in order to reverse the policy on tracking, which seems to have some effect.
Generally speaking JS code that makes request to server is covered by ePD while actually processing that request server side is covered by GDPR (there are some nuances to this).
The problem with this view, though, is that even the very agencies propagating these rules do the exact same thing! You can go to any site from an EU arm and get the same banners.
At this point, you can't really blame it on bad-faith actors, you have to accept that it's a bad rule. Which is not to say I know a better one!