In the vast majority of cases I reject analytics and telemetry not because I don't want the company knowing which buttons perform better, it's because I don't want some third-party scum like Google Analytics to know that.

Analytics can be done in a privacy-friendly way, but the vast majority of them aren't, and as a user there's no way to know whether that's the case, so the default "safe" option is to reject.

Also, it's not the GDPR that's to blame for the popups, it's the non-enforcement of it. GDPR explicitly outlaws annoying consent flows - here's the guidelines one of the regulators suggests, which 90% of implementations out there don't comply with: https://ico.org.uk/for-organisations/guide-to-data-protectio....