Twitter is a business, just like any other, ultimately, they own all the usernames, you're just using them, if they see a better way to assign a username, why would they not chose it? You're getting value out of the twitter network, and twitter has every right to do what makes more sense to them. If users don't like the decisions Twitter is making, they will leave and then Twitter can feel sorry for screwing it up.
I don't know why people expect to use a free service like they are owed something. If you were paying for your username, it would make sense, but you're not, so shut up (tongue-in-cheek)!
While on one hand you make a point, on the other hand, perhaps this article can simply be considered community advice to Twitter: if Twitter wants to protect the stability of its platform then perhaps it should consider more explicitly stating its Terms of Service with respect to username ownership.
Twitter is a business, just like any other, ultimately, they own all the usernames, you're just using them, if they see a better way to assign a username, why would they not chose it? You're getting value out of the twitter network, and twitter has every right to do what makes more sense to them. If users don't like the decisions Twitter is making, they will leave and then Twitter can feel sorry for screwing it up.
I don't know why people expect to use a free service like they are owed something. If you were paying for your username, it would make sense, but you're not, so shut up (tongue-in-cheek)!