IP address based then, I'd guess. Or maybe browser/device fingerprinting. Here's what I see
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They are trying to programme/train us like computers or animals.
😏
I mainly consume YouTube videos via commandline these days anyway
GitHub
GitHub - yt-dlp/yt-dlp: A feature-rich command-line audio/video downloader
A feature-rich command-line audio/video downloader - yt-dlp/yt-dlp