Every company makes mistakes. Who hasn't fallen behind on site copy? Granted their responsibility to keep documentation up to date is much greater than most of ours but I'd like to think (and I believe) they were not willfully deceiving their entire Rails customer base. I am still a fan.

But they didn't correct the problem -- they should have refunded at least some of their costs.

Are you sure they didn't?

Refunds could easily have been something evaluated on a 1-by-1 basis, quietly, to avoid creating a stampede of requests even by those negligibly affected.

Notably, despite all the public feuding, RapGenius today still appears to be served by Heroku.

Heroku is amazing, hands down. It's a shame you don't give them credit for all they've done for web app developers.