This time they started blocking both residential IP addresses and VPNs to discourage yt-dlp, NewPipe etc. From what I noticed, you need to use official website to load cookies and maintain that session to continue watching videos. It’s irritating. I hope they fuck themselves and go out of business.
They block 3rd party tools like yt-dlp, NewPipe etc from residential IP addresses. Probably they deployed solutions to differentiate normal YouTube session on their website and automated tools.