Oh wow, perhaps I was too terse and left too much room for interpretation. I meant that there is no way for a for-profit company to eventually sell personalized segment data once it has it, even if there were initial promises not to do so.

In that regard, the "siren call", as dwohnitmok says, it's a very appropriate way of encapsulating what I meant. You can be bold and not do it, but as soon as you have investors, they are going to demand it , pressure you into doing it, and if you do not comply replace you with someone who will not be sitting in a potentially profitable line of business and do nothing.