Pretty sure something screwy was happening on YouTube’s end. Had a captcha and didn’t let me solve it (can’t recall the error code) ended up turning off my router for 30mins to get a new IP (compared both the old and new one) and added a VPN to my router for good measure and it seems to be working, not sure for how long though. Seems other people also had this happen so just wanted to post my findings here just in case anyone else is having this.
Yeah, YouTube is once again doing some shenanigans. My home IP address is not blocked from the YouTube site, and certain invidious instances are working. yt-dlp has the same issue as NewPipe (asks for captcha, sends back 405 by default). Using a VPN seems to solve the issue.
I was a bit afraid that YouTube just outright blocked my IP, as others in my household use YouTube. Luckily it’s just NewPipe and yt-dlp, and a VPN solves it.
Nevertheless, it doesn’t bode well that YouTube is going to such extreme measures to prevent NewPipe/yt-dlp access.