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YouTube warns it might make your viewing experience worse if you don't turn off your ad-blocker
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
I thought All three of the ones I listed weren't reliant on YT APIs and instead scraped their content.
Edit: Just confirmed both NewPipe and Freetube do not use YouTube's api. I'm not sure about GrayJay though.
Even the scrapping in theory could be restricted. I might be wrong there.
Possible maybe, but at that point if YT bascially becomes paywalled I will just stop using it entirely like I did with Reddit.