They can tell the IP of your server is nonresidential and don't trust it either. But I'd expect it to sometimes work.

I've seen a few places they started blanket banning data centre ip ranges since late last year.

I would guess you're using a bunch of privacy protecting features that's preventing them from verifying your browser/device. Unfortunately, being anonymous is the same as looking like a bot.

Use NewPipe. It only ever gets blocked if you're on VPN or if YouTube did an api update and the app needs to update to match.

If you want to view the content, its change the VPN server or use a residential IP. Residential proxies exist but are expensive and I'm not aware of any residential VPN services.