Well… if it is that easy, might as well make the sequences proprietary again (change them for security), but it should not cost very much after all to add such functionality. At least not nearly as much as Elon thought.
Focus is a very real thing in business, starting an additional product that has a minimal overhead can still end up ~2-3 years later as a massive cash drain with a complex hierarchy of workers with a very small ARR. That's why you take on customers before building it.
In these scenarios you will usually see the vendor default to locking down the platform/hardware, if for nothing else to prevent people from buying it and re-purposing it due to subsidized components included.