I always tell my PMs that the earlier PMM is looped into feature development planning, the better. Of course, we want enough lead time to prep for a successful launch. But even before we think about the launch, PMM should bring their insights to the table when the team is in the planning stages. This allows us to bring feedback from the field and customers, as well as share any market or competitive trends we have discovered.
Ideally, it's a combination of the GM, product management and product marketing. The GM would set the overall business goals for the year or quarter including revenue. The PM often drives the product launch adoption and revenue goals for that product. PMM often builds the plan with the metrics to help back into those goals.
The important thing is that if you see a gap, make sure that someone is owning all of these goals, otherwise, it will be meaningless to have launch metrics.
I think you’re asking if it’s behind a pay wall and not just a free product? If that’s the case, you need material (video!) that can act as a demo, people want to see product, not just read about it. Salespeople who can give great demos and free trials are often a really effective a launch tool.