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Because I've seen people sued for less. Patents expire in roughly 25 years, give or take, but trademarks do not. The trademark on Kant Twist is still active, and according to TOS on this site:

"3.3 Acceptable Use Policy. The following is the acceptable use policy which sets forth the restrictions Users must adhere to on use of the Sites or Services (“Acceptable Use Policy”):

(a) You agree not to use the Sites or Services to collect, upload, transmit, display, or distribute any User Content (i) that violates any third-party right, including any copyright, trademark, patent, trade secret,--"

What others do or do not shouldn't be a considering factor on whether you should upload content that you have no permission for.