If you want things, you get them written into the contract. that's how business works. Eg the license for Facebook's llama model says if you have a ton of users you gotta pay up. if this were something small, like maybe give us a shout-out once in a while then hey, but we're talking substantial actual resources that shouldn't be left to implied assumptions. because if you don't actually talk about it, what I assume and what you assume is reasonable is going to be on different planets.