And then what? Best case scenario is: those client apps get in touch with Twitter and negotiate a per-user rate to be paid to Twitter. This could be a great w

And then what? Best case scenario is: those client apps get in touch with Twitter and negotiate a per-user rate to be paid to Twitter. This could be a great way for Twitter to allow third-party clients, but get a cut of the revenues from the non-free ones. And it allows Twitter to decide this on a case-by-case basis. (Or, maybe it's just a way to force very popular commercial clients into complying with whatever Twitter's revenue-generation plans end up being).