The best bypass is to use Firefox. uBlock Origin works best in Firefox:
https://github.com/gorhill/uBlock/wiki/uBlock-Origin-works-b...
Never realized anything was happening as I was on Firefox, until I saw ads as my wife was browsing youtube despite installing ublock for her years ago.
YouTube recently started showing ads through uBO in Firefox.
On what platform? I've been using Firefox and uBO on Linux and Android for over a decade and never seen a YouTube ad.