I would be a lot more okay with them removing FSD from cars being sold if the FSD transferred to the next Tesla you bought, like a license to have the feature.

That isn't the case, though. I paid for FSD on my model 3. If I trade it in for a Model Y, I don't get to transfer my purchase, but you know that they're going to charge someone else to enable FSD on that vehicle. It's double-dipping.