Of course it isn't. Pihole and similar DNS-based blockers do nothing for those kinds of spam which require performing DOM manipulations to be removed. Check uBlock settings after installing it. It has a separate "annoyances" list. I enabled everything in it a few years ago and never had a single problem. It removes all the GDPR banners, "please give us your email" popups, useless "oh I am so original" plates in forum signatures, etc. etc.