> Wouldn't black market identities be worth MORE if they weren't so easy to get?
No. It's already illegal to buy and sell identities, so black market demand for identities is likely at a maximum already. I'm just using that number as a proxy for what your clicks on the internet must be worth. I'm basically making the assumption that Value(Clicks) < Value(Black Market Identity), which I'd say is a fair bet.
> So the more we tax / regulate it, the harder it is, the more valuable they get. Win-win for everyone.
Again, this wouldn't be true for black market identities, but let's look at clicks.
What I'm saying is that the click you give a way is worth too little to be taxed at all.
Say 1M click data points is worth $1K (which I think is still very generous given the amount of noise) that means each click is worth 1/10¢. Any company that sells the 1M clicks to another company will pay taxes on the $1K of income. So if you increased taxes, you would discourage them from selling your data to another company. This doesn't change your behavior though as a consumer. You still give away an untaxable 1 click at a time (1/10¢): which is not taxable as a gift because of the size of the amount (even 1K clicks is only $1) and because the company can easily argue they provided you with a service in exchange for that 1/10¢.
What you're looking for is a way to penalize companies for receiving data (i.e. for every data point you gain, you owe some $x in taxes.) This would need to be legislated since that's not currently how tax law works.