Starlink never originally advertised the ability to transfer service or even sell your hardware. It was very clear from the beginning you had to use it for the address you provided, and their communication was very clear to that effect.
You are definitely correct that logically you should be able to sell your kit, transfer service, or just move with it (Elon has said you’ll eventually be able to use it on an RV). But you took that logical end result and set your own expectations based on assumptions that were not aligned with reality.
You are not in the target market, of course you’re going to be frustrated.