[cstone]

Your python script uploads my code to your server and sends me back a binary in return. What happens when that server goes down?

Getting people up and writing code on devices quickly is awesome; but sending code (unencrypted, even) off is pretty shady, particularly since you're not disclosing it to anyone.

Arduino manages to have a cute little barebones IDE based around an actual compiler; and they provide full hardware docs, links to datasheets, the works. You're doing exactly the opposite of that. Even Apple will let me compile code for my own iOS devices -- after I've paid the $99/year fee or jailbroken, of course...