If you want to get rid of this nightmare, Ghostery adblocker have a Never Consent feature that just kicks out any CMP instead of saying no to everything, which as a result prevents advertisers from receiving the tcfapi() response, leading to most ads not being displayed at all.
Looks like Firefox Mobile's Ghostery add-on is outdated and doesn't have this feature.
EDIT: It looks like I was sort of wrong. The setting doesn't seem to show up in the main app settings, but I went to a site that had a cookie consent form after installing Ghostery and Ghostery gave me a pop-up asking if I want to enable NeverConsent on this website and/or all websites. So it looks like it does work.
They have to be explicit because before they were implicit and selling your cookie data all over the place. So legislation says you have to be explicit about your policy and usage.
Too many sites still use cookies in a way that's not necessary though and I'm looking forward to the de-cookification for a lot of things.