tumbler is included Fedora repo.
But "TUMBLR." or "TUMBLR" is trademark.
I think that this is trademark problem, It is non-free.
I suggest that resolve trademark problem.
This package has changed ownership in the Fedora Package Database. Reassigning to the new owner of this component.
I feel this is something only legal can answer.
Perhaps an email to fedora-legal?
This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle.
Changing version to '26'.
A very similar bug 1404936 for perl-Data-Tumbler was closed NOTABUG. IANAL but I don't see why the same logic would not apply here.
Closing since we have a comment from Spot on that bug.
"I agree. The likelyhood of confusion here is practically zero. Closing."