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YouTube is now hiding the skip button on mobile too
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
That's odd, I'm surprised Rossman didn't upload it to that app store. Well, in the meantime you can get it directly from https://grayjay.app/. Should also be the first result in google, if you want to search yourself instead of trusting a randomly provided link.
It is in FUTO's F-Droid repo that you can add.