[hackpert]

That concern immediately screams for an "in perpetuity" agreement that can perhaps only be amended (like a constitution or other open source licenses; amended for updating technology etc.) within certain pre-established limits that are hard to circumvent, such as a limitation on the use of health data for profit via insurance. As long as the company agrees to stick to such an agreement for every customer forever, I don't see the problem (unless, of course, they are secretly selling data that you never find out about and can thus never sue them for -- I don't know how likely that is).