Not really, my website doesn't :-)
In case you're using Google Analytics, it's easy to make it compliant, you just activate IP anonymization, which you had to do anyway, out of common sense and because tracking by IP without consent was illegal anyway in countries like Germany.
[1] https://support.google.com/analytics/answer/2763052
[2] https://developers.google.com/analytics/devguides/collection...
> When I visit a hifi store with my smartphone, next day my Desktop PC will show me nothing but hifi ads.
Yes, I saw this behavior too, but I like to think that many businesses are not as unscrupulous. But I do take care of my privacy as an ongoing investment ... I'm Google free, I sandbox Facebook, I use privacy blockers, VPN, the works.
GDPR is IMO a godsend. I'm sure the cost will be high for many companies, but that's just karma.