Not disdain since I accept the premise the Thingiverse user can place that license on the design. I question whether that was an appropriate choice.

I can do the Sherlockian inductive reasoning thing and postulate that "mathgrrl" resides in North America since "math" rather than "maths" is the preferred noun for most English speakers in North America. Using mathgrrl's profile on Thingiverse I can confirm the postulate and narrow mathgrrl's residence likely to be somewhere in Virginia.

The license a designer puts their design under shouldn't seem arbitrary. If I print the design from your link my choices and possible uses are more limited by license than the design I linked to even though both are essentially the same design. If mathgrrl added something original then I would understand why that file for download from Thingiverse has more restrictions under its license.