Someone correct me if I’m wrong, but my understanding is that since LW will federate with them, any content they host, will end up on meta.
For example, this discussion we’re having right now is on !technology. So it doesn’t matter whether our own instances have defederated meta - our posts and comments here will bring them value. Directly, in the form of content. And indirectly, in the form of processable data for machine learning, shadow profiles, etc.