Since I update to Catalina, Adblock, Adblock plus do not block anymore. Adds appears in the first page and many time during the session, By default like in Mojave, the control panel authorize the adds, but if we de authorize adds they still show. I reboot with mohave and don't have these effects anymore. In Cataliona Safari as soon as you open youtube, Ubers delivery add show up.
Thanks to you for the development of this social app.