I’ve been developing and subscribed with Cloud9 for around 1 year and from a developer standpoint, I can completely understand where the C9 devs are coming from when they want to get this level of validation from their users.
C9 opens up a very powerful development environment to anyone, it’s a fantastic place to work and it doesn’t matter where you are, you can just log in and carry on… home, work, goto the other-side of the world if you want.
But, unfortunately this opens up a platform for ill intent. Hackers, spammers, scammers, blackhatters, wrong-doers around the net. Ultimately whatever these sorts are doing ends up coming from Cloud9’s IP addresses.
These servers belong to them and if they don’t take care of them, the result is they get blacklisted for all kinds of awful shit. This is a good way of dealing with it! I would do the same.