I see what you're getting at but I feel that once we get past the GRRM specific example some of the same issues still remain.

For example if it was instead a GRRM & JK Rowling and wrote in a style of the two in my eyes it hasn't escaped the problem of the GRRM AI it's compounded them by adding one more author who's works is being used. Then we could extrapolate that out to it's true scale where it uses most written literature (although some presumably pub domain).

I just see it as if doing it to one person's work is wrong doing to two people's work aught to be twice as bad.