As someone who just received a cold call from recruiter I never heard of, with a 4 years old CV and haven't been on a job board for more than a year I must say that GDPR didn't do much. I actually previously reported a recruiter to the ICO for 3 different violations (no data disclosure, cold call, old CV) and they did nothing but advising not to keep CVs for more than 1 year.

/rant off

I feel that your point, even if valid, doesn't quite apply to what I'm describing, which is to go around ad blockers.