I'm not the author, I just though the service might be useful given the impending shutdown of RSS access to Twitter and the continuing demand for it.
Yes, they are violating the Twitter TOS regarding naming/branding, but it should be easy to work around it.
So far it seems the site hasn't had much exposure, and I'm interested in how Twitter will respond to it if it increases. If they really want to prevent the re-packaging of user's tweets into RSS feeds, and depending on how they're obtained (through API access, plain old HTML skimming, etc..) things could get interesting.
Just to clarify, it shows your followees, as in the people you follow.
It currently shows up to 100 followees because I use a single twitter API call. Some of the tweets being empty is probably because that call is deprecated (and would have to be replaced by two calls). Given their whole API version 1 is now deprecated, replaced with auth-requiring 1.1 that would break the simplicity of the current app, I didn't spend too much effort on polishing it.
However, feel free to open an issue, if enough people +1 it, I'll try to fix it sometime. :)
They will block you for using "twitter" in the url. They own the trademark, so the name needs to be changed.... and yes, they will most definitely cancel your keys! But I like your idea! It's very cool.