It definitely helps that it's also a great (though imperfect) browser.
Fines are only the slightest punishment.
Also blocking is not as good as intentionally poisoning with something like Ad Nauseum
Maybe I'm just lucky, but even this argument is quite ... meh
I.e. I can count the number of times I said "wow, uBO Lite didn't make this site usable but loading up Firefox with uBO and it worked fine" on one hand. At the same time, if I ever look and compare how much is actually getting blocked, uBO is definitely blocking way more. Doing a side by side compare of dozens of sites it becomes easier to see minor differences I wouldn't otherwise have noted, but may not have mattered as much.
You won't "feel" this in your day-to-day browsing, but if you're concerned about your data being collected, v2 matters.
I'm sure this will all change eventually though and YouTube has a loophole planned so ad blocking on manifest 2.0 is impossible.