Ads are a violation of the sanctity of our minds. They are not entitled to our attention. It's not currency to pay for services with.
At some point some shareholder value maximizing CEO is going to sit down and notice just how much money he's leaving on the table by not advertising to paying customers like you. It's simply a matter of time.
Take a third option. Don't pay them and block their ads. Block their data collection too. It's your computer, you are in control.
If you truly have those beliefs the right moral action is to not use YouTube at all but god forbid you'd have to make any sort of sacrifice.
Edit: let's step through this. If I use a towel placed over the computer to block ads, that's morally the same as using blocking software, I think? If I block the ads by putting my fingers in my ears and staring at the ceiling, also the same thing, morally. If I block them by watching them in a negative frame of mind, saying that I dislike ads and won't do what they suggest, I'm still doing the bad thing, the same as using an ad blocker - if it is a bad thing. My obligation, if it is an obligation, is to be receptive. Otherwise what, it's a sort of mind-fraud?