No, it's not a zero-sum game, but it would be a game I'd feel more comfortable playing if they didn't require me to give up this information.

Fortunately, the world of stand-alone non-spyware applications isn't quite dead yet.

Having said that, I just realized that that's what web-based services like this are analogous to: spyware.

All these web-based services, from Facebook to MySpace to Google itself, are actually web-based spyware, and people are eagerly using them.