Not OP but I believe most of the surveillance derives from third parties. The government doesn't directly control or monitor most of the surveillance tools (google, telecoms, geoloc, &c.), or at least not in most advanced countries. But it's getting easier and easier for them to access these data and there will probably be less and less safeguards.
For example in France we're in a permanent "state of emergency" since the attacks in 2015 (and now with covid), which grants more rights to the government/police and let them bypass some legal safeguards for "the greater good" but of course it's already being abused, not against terrorists, but against protesters, people squatting land to protest against projects that would have a negative impact on the environment (https://en.wikipedia.org/wiki/Zone_to_Defend), &c.
For example in France we're in a permanent "state of emergency" since the attacks in 2015 (and now with covid), which grants more rights to the government/police and let them bypass some legal safeguards for "the greater good" but of course it's already being abused, not against terrorists, but against protesters, people squatting land to protest against projects that would have a negative impact on the environment (https://en.wikipedia.org/wiki/Zone_to_Defend), &c.