1. government gets new income source.
2. government is invested in making sure they are not getting short changed.
3. failure to pay me is fraud.
4. When you pay me now I know your crap is spying.
5. Government taxes almost never go down, with this system it going down will immediately be visible to consumers who will balk.
Problems: ad revenue is the new shrink-flation without it prices will rise. companies will fight this tooth and nail, but voters get "free" money.