Whenever things like this come up, I think "What can I do with their 'official API' that I can't get from just parsing the regular twitter.com/(URL goes here) pages?"
You could certainly build a barebones scraper in a very minimal amount of time, and that would probably work forever.
The amount of work required to go from "bare bones" to "actually pretty nice" ala Tweetbot is not a trivial amount of work though.