As a creator, I learned the hard way that any content posted online could and would be stolen -- at best reposted without attribution, at worst plagiarized.

At a certain point, I accepted that it's just the cost of doing business online... you can spend your time fighting it, or focus that time on making new stuff.

(yes it's a defeatest attitude, but it's self preservational for your sanity -- and sanity is important for creative work to be sustainable.)