If you go to uBlock Origin’s settings and then select ‘Filter lists’, there’s a list maintained by EasyList and another by AdGuard that both block cookie notices. To my understanding, this isn’t enabled by default (at least it wasn’t when I installed uBO).
Apologies if this is common knowledge; I didn’t know about it until recently.
Why YSK: Cookie consent pop-ups are annoyances full of dark patterns designed to frustrate you into affirmatively opting into superfluous data collection and letting companies profit off your information. Saving just a few seconds on pages you browse adds up, and this is especially true if you use something like Cookie AutoDelete that makes your answers to these pop-ups transient.
So as I wrote in other comments, I selected this filter list and cookies warning disappeared. After a couple of days I noticed a simple troubleshooting, login (in feddit for example) can’t be permanent and requires login any time. I guess there’s no way out.