The signup process doesn't appear to be invasive, my guess it will be to encourage an upgrade to Sonar Platinum and also to flog proprietary plugins via marketing emails which can be unsubscribed
O.K. Seeing 'sign in with facebook' set the alarm bells ringing with the baggage that crowd seems to be carrying around lately.
Now I get the ever so helpful 'BandLab' assistant popping up every time I boot up the PC.