> I wouldn’t be so sure that any next government will necessarily reverse this.
Agreed. I think the supposed justifications for mass population-wide online surveillance, restrictions and de-anonymization are so strong most political parties in western democracies go along with what surveillance agencies push for once they get in power. Even in the U.S. where free speech & personal privacy rights are constitutionally and culturally stronger, both major parties are virtually identical in what they actually permit the surveillance state to do once they get in office (despite sometimes talking differently while campaigning).
The reason is that the surveillance state has gotten extremely good at presenting scary scenarios and examples of supposed "disaster averted because we could spy on everyone", or the alternative, "bad thing happened because we couldn't spy on everyone" to politicians in non-public briefings. They keep these presentations secret from public and press scrutiny by claiming it's necessary to keep "sources and methods" secret from adversaries. Of course, this is ridiculous because adversary spy agencies are certainly already aware of the broad capabilities of our electronic surveillance - it's their job after all and they do the same things to their own populations. The intelligence community rarely briefs politicians on individual operations or the exact details of the sources and methods which adversarial intelligence agencies would care about anyway. The vast majority of these secret briefings could be public without revealing anything of real value to major adversaries. At most it would only confirm we're doing the things adversaries already assume we're doing (and already take steps to counter). The real reason they hide the politician briefings from the public is because voters would be creeped out by the pervasive surveillance and domain experts would call bullshit on the incomplete facts and fallacious reasoning used to justify it to politicians.
Even if a politician sincerely intended to preserve privacy and freedom before getting in office, they aren't domain experts and when confronted with seemingly overwhelming (but secret) evidence of preventing "big bad" presented unanimously by intelligence community experts, the majority of elected officials go along. If that's not enough for the anti-privacy agencies (intel & law enforcement) to get what they want, there's always the "think of the children" arguments. It's the rare politician who's clear-thinking and principled enough to apply appropriate skepticism and measured nuance when faced with horrendous examples of child porn and abuse which the law enforcement/intelligence agency lobby has ready in ample supply and deploys behind closed doors for maximum effect. The anti-privacy lobby has figured out how to hack representative democracy to circumvent protections and because it's done away from public scrutiny, there's currently no way to stop them and it's only going to keep getting worse. IMHO, it's a disaster and even in the U.S. (where I am) it's only slightly better than the UK, Australia, EU and elsewhere.