They definitely do, but there's a difference between being subpoenaed (i.e., forced to comply) and deliberately choosing to work with LE because it's profitable

They definitely do, but there's a difference between being subpoenaed (i.e., forced to comply) and deliberately choosing to work with LE because it's profitable to you. A cop can force me to show him my emails or text messages, but that doesn't mean I want to or that I'm making money any off of it. On the other hand, if I offer to let them read my emails for the low price of $10... And literally anyone can be subpoenaed in the same fashion—FB and Google aren't unique in that regard. LE could subpoena the guy who runs your local deli and force him to hand over a list of every customer who came in on a certain day.