So, I don't have a comment on specifically doing Zuckerberg, but a practice adopted by a number of companies that make a product that can reasonably be used by employees is to try to have employees actually use the thing, because that makes them aware of things that need to be changed or other issues or improvements and more-interested in doing so. That is, in general, as a company, you're likely better-off in terms of filling user needs if employees actually use whatever they make, especially if they're in a position to make decisions about how it works.

https://en.wikipedia.org/wiki/Eating_your_own_dog_food

Eating your own dog food or "dogfooding" is the practice of using one's own products or services.[1] This can be a way for an organization to test its products in real-world usage using product management techniques. Hence dogfooding can act as quality control, and eventually a kind of testimonial advertising. Once in the market, dogfooding can demonstrate developers' confidence in their own products.[2][3]

Not everywhere I've worked has done that, but at places where it was applicable, they tried to do so, including one handing out free hardware if necessary to use the product, as well has having the company itself make use of the products if possible. I think that it's generally a good idea; it makes people at the company in a position to improve things very aware of pain points.

If

and I have no idea if this is actually the case

Meta is trying to position AI models they make to act in a "contact the company" role, they might want to have their employees actually doing that themselves.