Earlier quoted context omitted.
In pretty much every interview, Yann has talked about how important that AI infrastructure is open and distributed for the good of humanity, and how he wouldn't work for a company that wasn't open. Since Mark doesn't have an AI product to cannibalize, it's in his interest to devalue the AI products of others ("salting the earth").
I don't see how they're devaluing other people's AI products.
The “0% of the cost” part is unique to software businesses because you can copy software so cheaply