This Gizmodo article over promises and has other issues, but it is worth the read. The referenced actions also work with ProtonVPN. I do not have YouTubePrime but am otherwise unable to access any videos while using an  AdBlocker, with no subscription access. “Without YouTube Premium, you’re doomed to watch ads every few minutes, sometimes more often. If you’re exhausted by head-spinning ads, consider purchasing a YouTube Premium subscription. Sensible, right? Well, not for everyone. YouTube Premium’s recent price increases made it unaffordable for many. People online have found a simpler way to block YouTube ads. You wouldn’t believe it, but these two VPNs make YouTube ads vanish in seconds!”