Yes, “claimed”. It is YouTube that “searches” and finds matches. AdRev, Identifyy and everyone else all use the same matching system, which is YouTube’s Content ID. They don’t have their own fingerprinting systems.
Have I found videos that AdRev missed? Yes, I have. But that is a Content ID miss. Would it have been missed by Identifyy? I don’t know…
I have new videos every month so they definitely have not “stopped searching for new videos”.
Then there are manual claims - and that’s where there could be a difference. Impossible to know exactly what, but I do have plenty of manual claims (meaning, done by AdRev manually) in my account.
Well, that’s a totally different issue which of course could make it hard for new applicants. 