But being forced to give away half your physical retail space is hardly the same thing as just letting them keep using an API that you provide explicitly for such use.

Also, more broadly: one would have quite a hard time making the case that Facebook isn’t nakedly, gleefully, and rapaciously user-hostile.

I think a lot of people who hate Facebook just have a hard time believing that most people just don't care about the same things you do, or to the same degree. They're still on Facebook and Instagram and Whatsapp because they see the world differently from you.

In this case, Facebook was deprecating the API and declined to provide special whitelist access to a competitor.

No? Where are you getting this read from? The documents clearly show them discussing it from a year prior to shutting down Vine's API access, and planning on announcing it publicly ~6 months prior.

I can't find anything from a quick google search on when the API deprecation actually took effect, but assuming the timeline from Exhibit 43 is accurate, Twitter actually had whitelisted access for over 3 months before being shut down.