There are truly out-of-control entities, such as criminal gangs, but most snoops have to obey laws, and if they are businesses generally chose to do as a cost-avoidance strategy (;-))
This large group of commercial snoops are currently trying to capture as many unhappy people as they can, and within a few years are in line for a harsh slapping about from enraged politicians: see the UK for a picture of what happens when newspapers crack people's cell phones. Now imagine what response you get when they start losing snooped credit card numbers.
Amex is already sensitive to this and related problems seen by their customers, and will issue short-term and single-use credit card numbers for transactions with doubtful merchants. I have every expectation that they will be asked to offer "avatar" cards, and after hemming and hawing, will issue me a card in my pen name, after taking some steps to make sure they can't be blamed if I'm the crook, not the merchant.
Given that, I'll have an avatar on steam with the ability to buy and sell things without exposing who I am. People named "John Smith" already have lots of avatars, all of whom think they're the real John Smith. This will do nicely for anything on-line or credit-card-centric.
Physical presence and photos are a different problem: we have weak laws about what used to be called "database matching", and we may need laws against keeping photos of me paying with a credit card any longer than it takes for the credit to clear. Of course, if I "pay" with a shotgun, I have to expect the pictures to be kept until they're thrown my ass in jail (:-))
Retaining data, and using it without the permission of the person who provided it has been a problem since the printing press was invented. Public libraries found that the were being asked for patron's reading histories, and created the now common policy of retaining the patron-book relationship only until the book was returned or replaced.
Private photos and lifelogs are harder to manage, but less harmful, as there are so very many of them, and are private to that person...