They would either be legally liable, or must reflect this in ToS—benefitting the next provider with simpler ToS. And remember, they would pretty much lose the

They would either be legally liable, or must reflect this in ToS—benefitting the next provider with simpler ToS. And remember, they would pretty much lose the ability to show ads (where mined data is used for targeting), since getting rid of them becomes as easy as switching to another client.