There's zero pay if 100% of their viewers blocked ads. There would also be zero pay if 100% of their viewers used SponsorBlock.
I'm not saying that on the balance it's wrong to use SponsorBlock (I'm a heavy ad blocker myself, and most of the arguments against SponsorBlock also apply to ad blocking in general), just that you can't justify it by pretending that you using SponsorBlock doesn't cost them anything.
