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I initial thought it was ad blocker or VPN but then I tried on several different machines on different ISP, with and without Ad blockers.
All had the same result.
I think it was just a temporary issue with YouTube because it is back to Working with out login.
Side Note: So far YouTube and my Ad blocker has kept working. Even know there has been several news articles in recent history. As you mention.
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this is from long time ago and is already everywhere especially if you use a vpn and a decent browser blocking crap. not even embedded videos could watch.