[gress]

What stops the cheat from accusing the original author of being the thief as a preemptive move?

[kiba]

What prevents lot of cheats popping up and accusing each other as a preemptive move?

Also, it's pretty easy to identify who's the original author. Simply, the person who posted it first is very likely the original author. Especially so if the author has a portfolio of works that identify the author.

[monort]

Author can put a hash of their creation on blockchain before publishing.