Generally, its because there are other elements making the band different. Producers or other band players that make the band not exactly the same.

Its nonsense, but its also nonsense that has been going on for a century in the retarded Music Industry and is almost certainly coded into the current Music App ToS in some way. The only reason its relevant now is because of the abusability of bots on Ad Money, otherwise the only reason it would ever come up is for dumb shit like insurance or unions.