This is what Facebook was also doing. They were buying data from any website they could. (They made data buying a profitable thing because they knew they could

This is what Facebook was also doing. They were buying data from any website they could. (They made data buying a profitable thing because they knew they could use that for ad serving.) If the US govt, if intelligence agencies are doing the same, are we calling this "illegal" or wrong? If so, why? If the US govt were to be doing this with a healthy dose of govt reach, then it would be a violation of law. But they are buying what is already available.