They have an apology here: http://blog.mightybrand.com/2009/02/we-goofed/

I can’t say it particularly bothered me—I just had to click one button to get rid of the e-mails—but it doesn’t exactly inspire confidence in the service.

At any rate, mistakes happen; I hope it doesn’t cause too much backlash for them. I certainly don’t intend to cancel my account.