I reported a video that copied mine and it was taken down in less then an hour.
The dumb ass didnt even blur out my screen name to the GPT I was promoting, all he did was change the music.
he even turned it in to the GPT site expecting payment, lmfao
The admin banned him and told me, I flagged the video and boom, case closed.
But I flagged it as spam, because actually YT hates spammy vids promoting websites.
Not sure what your vid contains, but flagging them for spam/misleading might be a better option.
IMO YT relies on the public to handle that part for them.
PM me their links, I will help you by reporting them for spam,
again, in my experiences, it works.
That is if they are infact a spammy, referral link type of vid, and if so, I wouldnt be reporting them as copying you, it may result in your own videos taken down as well.