Spot on, I've worked in multiple small, medium and large companies. And these internal platforms almost always turn into ivory towers of useless churn.
Even if being forced to use it internally, in a lot of cases the projects ended up buying the same solution (or a working version of it) from an outside vendor when it came to fulfill actual customers needs on the outside.
If that wasn't possible we built what we needed ourselves.
If you have internal customers, I still believe you need internal incentive alignment. Otherwise what the platform builds and what is actually used and needed drift apart.
And you need at least one real customer project to dogfood the platform initially. Because most platforms start out way too generic with pure architecture astronauts [0] at the helm.
If you don't have a project-0 to test those assumptions against, you don't need to start that platform.
[0] https://www.joelonsoftware.com/2001/04/21/dont-let-architect...