[parasubvert]

Using an online service means you're participating in the current market system. Short of a popular global scale non-profit that wouldn't be up for sale, I'm not sure there is a solution to the problem of "how do I get warned if someone buys my favourite service". It's generally not a problem for most -- you put your data up, you took the risk, and most are just fine with giving up their privacy for convenience (I know I am).

Beyond privacy legislation (unlikely and probably draconian), there is only one solution to the problem that I see: help build the next generation of open web protocols so people can host their own private services and talk to one another without anyone having your data.

This would be the most private/open/free way to go, though the problem with that is there's basically no money in it yet. And no one has figured out how to make it a compelling user experience.