If you want to watch YouTube without ads on your phone, go to the website using the Brave browser -- it works perfectly.
The problem though with ad-tech is while browsers/uBO may work currently, it is a cat/mouse game and the big boys will win with their huge budgets and genius developers. Niche browsers like Brave/Orion and uBO extension are already probably getting to the point of being overwhelmed by constant breakage of YT/Twitch/Etc ad blocking.