Do you have a valid trademark in the domain registrars/hosting country?
No? Than as annoying as it is there are few options. However, "About Us" pictures of people at your company do have implicit copyright, and image misuse is 100% enforceable with take-down strikes.
Mostly endured the problem by posting our fiscal mistakes like a running joke, and proudly presenting them for others to "clone". Some folks are even brazen enough to try to sell trademarked squatter-domains. The good news is the .com and country suffix usually ranks higher in searches than most domains by default.
The truth is if you can be cloned with ease, than the product likely falls squarely in the low-hanging-fruit category. Thus, as a business model it is unsustainable.