I don't even know if its UMG themselves, the Content ID scammers they hire are the ones filing the bogus claims every time I've seen. Yes its ultimately their fault for hiring them, but it goes crazy
Some of these content ID scammers go so far as to upload commercially available or even royalty free drum samples and put them in the ContentID system and file strikes. It got real interesting a few years ago when they tried to pull that with the infamous Slate Kick 10 sample