Hey there!!
Honestly, what's wrong with using a tag, even if it doesn't match their content? It doesn't hurt anyone. In fact, it may draw awareness to your cause/interests! :) Although it's rare, I've had people use my tag when it really doesn't concern me, but I always just try and make sure to answer the post that has it. It's like a bat-signal for me, ahaha!!
And again, KT automatically suggests tags when you create a post. Some users (namely new ones) just click at random or grab the first few that are suggested. When I make posts, your tags often come up as one of the first few suggested, even though I never post about that sorta thing.
Besides, how would KT even create something like that? AI?