Disney files copyright claims over Loki fan art
dailydot.com
dailydot.com
A. The link is very clear that Redbubble does this proactively and it doesn't mean the rights holder filed anything.
B. Redbubble does not say what kind of rights were potentially violated. Names of things aren't covered by copyright, and - if anything - this would fall under trademark, not copyright.
C. It bears mentioning that I agree with the general idea that even a trademark claim over the Norse god Loki in a way divorced from the MCU would be ridiculous. However, see again point A.
> and it doesn't mean the rights holder filed anything.
The article says: "The rights holder, in this case, is indicated to be Disney Enterprises, Inc.". So apparently the rights holder did something, otherwise how would Redbubble know who holds the rights?