Call me a cynic, but I think that might be the desired intent; the main difference now being that there is the initial framing, which may the only true effect Twitter's policy may have, I think: you will approach the tweet differently if you only see it through that framing.

It will certainly be abused for much more ambiguous things if they continue to hold the policy. If they don't, then they've shown themselves to be political in motivation, which is not good for anyone. So it's a loss all 'round.