Worse example? You might draw a sweet innocent picture and someone tags it with loli/shota, or some chubby chasing shit. Like fuck. I should't have to tell people not to do that. Compared to that, tagging as kin is nothing.

But ehh, Tumblr. I'm thankfully not a popular artist so I've never yet had to deal with art theft. The closest was an archive that took my work without notification but credited it. I did ask them to take it down, because in a perfect world I know where everything I make is posted and can take it down if I wish. Pinterest, of course, doesn't respect that at all.