> The problem is that they've let people have access and build upon their free API and pulling the rug from under them is going to annoy them [..]

Yup, although we all know that Twitter just the latest example in a loooong line of companies to have pulled this stunt since, well, what feels like forever.

> and generate bad will towards Twitter

I'm fairly ambivalent about this aspect, and I doubt Musk cares much, it's not as though the haters weren't already hating before this latest incident.