I can only add my own anecdotal experience for whatever that is worth. I do not have a Google or Youtube account and have not been experiencing this. I do not

I can only add my own anecdotal experience for whatever that is worth. I do not have a Google or Youtube account and have not been experiencing this. I do not use a VPN and I do use NoScript+uBlock and some hardening options for Firefox. The only time they have required a login from me was for a video flagged "adult" but I get around that with yt-dlp. They have never blocked my use of yt-dlp from my home IP same static IP for years. They did however block me using yt-dlp from a VPS provider. Bandwidth exceeded despite my having that IP for years so I assume they now aggregate VPS providers IP addresses by CIDR or AS number. Perhaps they are aggregating iCloud Private Relays by CIDR or AS number as well?