The GPL is about freedom to take your code and make it mine. That doesn’t mean you’re unprotected, it just means you need to protect yourself.
The patchwork elephant of websites means that there isn’t one answer for everything.
With great freedom comes some very odd responsibilities when it comes to reselling products.
It’s left, it’s right, it really all matters how you protect yourself, but also your readers.
Stealing GPL isn’t impossible, it happens more often than I’d like, and it could be easily avoided with a simple attribution of effort.