I don't know, personally I've never liked the idea behind that app. It seems like a massive privacy risk. I know if it is open source there is less of a risk, but I still don't like the idea of people being encouraged to constantly post themselves and their surroundings.
I use piped/libretube, not an alternative but a different frontend, content is scraped from yt, so google cannot track you. The downside is that some instances can be unreliable and you can't like or comment. Subscriptions work but I don't think they contribute to a channel's sub count.