If we're assuming bad faith in the part of the government, and we assume the private sector collects all that information, then there is no point opposing surveillance efforts. It would be trivial for the government to storm a Google data center if they really wanted that information.
There is absolutely a point. It's possible to oppose surveillance on multiple fronts.
The whole point of checks and balances is that the government doesn't do everything it can do, nor does it act as a unified whole. A bad actor in one branch can be held in check by a good actor in another. If the police/FBI/whomever wanted to storm a government center, it's theoretically up to a court to determine if that is legal and constitutional.
