Twitter Annotations are coming and Google can't get their act together to compete so they try to spoil the party.
Look Twitter is a small company that struggles. They're trying to ship an ambitious, potentially revolutionary feature called Annotations. They don't have to do it. There are probably people inside the company that wonder why they are.
If you work for Google, you work for a much bigger, much richer company. If you want to take cheap shots at Twitter, at least have the good grace to quit your job and do it from the sidelines. When you do it from inside The Machine you make it look very bad. You make it look like you can't compete in the market so you try to spoil it for those who are trying.