Credit where credit is due, Meta has had a fantastic commitment towards open source ML. You love to see it.
Not to diminish the value of the contribution, but "commitment" is an interesting word choice.
When you send something interesting to thousands of people without vetting their credentials, you'd expect the stuff to get "leaked" out eventually (and sooner rather than later).
I'd say it's more appropriate to say the weights were "pirated" than "leaked".
That said, you're probably correct that the community that quickly formed around the "pirated" weights might have influenced Zuckerberg to decide to make llama2's more freely accessible.