For most venture-backed open source projects, "open source" is and will always be a marketing tactic. It's a way to appeal to developers and beat out close-source competitors in procurement.
Users of these projects should expect something like the Skiff sell to happen -- especially if the project is open core or does not use a truly permissive license.
Wonder how the folks at Runway and Pika are thinking about this.
To me, it's becoming increasingly obvious that startups whose defensibility hinges on "hoping OpenAI doesn't do this" are probably not very enduring ones.