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You need to setup your own set of API keys (fairly easy) but it canl break for a week or so at a time when YT make changes that need updates for but it's reasonably rare (one every couple of years).

I've never added API keys and it mostly works fine, need to retry a link sometimes (youtube a/b testing things I guess?) and I imagine it can't play age-gated videos.

YouTube nerfed their api in a way that using third party clients is from hard to impossible. Things like requiring users to register api keys etc.

I use NewPipe and choose to stream to Kodi. That has worked fine for the last few years, even with an outdated Kodi YouTube plugin.