This is all hypothetical of course. Don't forget, that while overall government empoyees are starting to shrink, the IRS is growing. As far as the traditional grocery stores, and the reward cards that go with them, the databases are already in place.
Another thing that's been bugging me lately is Linkedin. I'm getting suggestions for people that I have met in my life, and barely know.................but there is a connection. I have no idea how they are compiling these lists.
If you expect what you've learned to outlive you............give it away.