> A corporate like Facebook would never allow that unless there was an internal shift in direction.
Sure they would. Flow has nothing to do with Facebook's business strategy, or its marketing campaigns, or even its corporate strategy. I'd be surprised if anyone on VP or higher even knows what it is.
Insofar as "NIH" wins at big companies, it's when there's a business motive to promote a certain technology or FUD about what other technologies might exist.
But engineering team A deciding not to use engineering team B's tools despite working at the same company? Happens all the time.
I'd consider flow dead.