[toast0]

Twitter was a platform company in 2011, but after they started limiting the api in 2012[1], I'm not sure that they wanted to be a platform anymore.

[1] https://blog.twitter.com/developer/en_us/a/2012/changes-comi...

[Quarrelsome]

I think you need to rate limit and auth most free consumer-facing end points, given the maliciousness of public traffic. Limiting it is just protecting yourself from its worst excesses, that doesn't necessarily mean you don't want to be a platform.