I see plenty of comments are focussing on this quote, re their Basecamp apps:
> These apps do not offer in-app purchase — and, consequently, have not contributed any revenue to the App Store over the last eight years
Apple have (freely) provided Basecamp a platform to grow their business via the App Store, whilst giving Apple (effectively) nothing in return.
Now that Basecamp want to grow their revenue further (at Apple's expense), AND they are breaching the rules (whether you agree with them or not) — I don't blame Apple for pressing the brakes. Especially not after all the negative press this whole debacle has brought them.