I mean if some company is selling, say, a Radeon 7600 module and then Framework comes out with their own "official" 7600 module then the third-party company is toast.
Alternatively, that means Framework doesn't need to spend resources building their own version, or acquiring a company that makes one. It's to Framework's benefit that they don't compete with module vendors. They just need to let the vendor list them in the official marketplace and promote them as a success story for the modular laptop concept.
With this in mind, trampling module vendors doesn't seem like a great idea. What's the point of creating an ecosystem if there's nobody around to participate?