It's not valid. But some punters try to make such a claim, in the hopes of a few dollars. It's fraud, but youtube/google cannot police it properly, because the bigger media companies _want_ to be able to make claims easier than a true DMCA claim. I do not believe this can be fixed, as they're diametrically opposed.

It isn't. The algorithm just can't distinguish between two performances many times.

Wouldn’t it be a specific performance? The performance at the funeral?

If it was a Catholic funeral, the order of the mass is certainly copyrighted.