YouTube doesn't let me watch without turning off my VPN?

I've been paying for Proton VPN for a couple years now and I've never been blocked by YouTube.

I'm also using uBlock Origin and Firefox as a browser. YouTube takes like 5-10 seconds to load videos, thanks to their built-in delay timer when ads can't play, but otherwise it works fine.

Honestly, I'd gladly wait 30 seconds staring at a black screen than watch a 10-second ad. So their delay timer is pointless.

Proton always works for me. I use it to get around geo blocking.