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

I find if I use my VPN and I'm not logged in, it says I can't watch unless I log in. If I turn it off, it works. I think if you're logged in, they can track you and monetize you. If you're behind a VPN and they also don't know who you are, they want to push you into telling them who you are.

What I've found as a workaround is to search videos using Duck Duck Go. It has a way you can watch YouTube stuff through DDG without being logged in. I imagine they'll eventually figure out a way to patch that.