I say otherwise. ;D
I do have some inside knowledge on the topic of creating logos and corporate designs, since I studied media design, so let me tell you something. This is NOT theft. It's a coincidence, which is quite common, especially with simple shapes like this. They are completely different, except for the BASIC shape. No lawyer could accuse dA of theft.
“Tell yourself at every step in the design process that someone has undoubtedly already thought of this and what can you do to really set it apart. In design, and particularly logo design, the pessimistic axiom that “everything has already been done” is becoming more and more true, and it is only the virtuous designer who can continue to stand out in a sea of sameness.”
— MIKE DAVIDSON
Now think about this before you blindly call other people ignorant, because that's extremely rude. ;3