For example, in Britain you can be arrested for modestly offending someone on Twitter, due to their speech crime laws.[1] That's never going to commonly be the case in the US due to very strong speech protections.
Australia did away with its guns. The US is never going to follow that example. Australia's actions were not a trial for what would happen in the US.
The large counter examples to your premise are numerous.
[1] https://www.independent.co.uk/news/uk/arrests-for-offensive-...
But yes, FVEY isn't an overarching conspiracy that implements all digital authoritarianism, nor does it have a monopoly on promulgating such corruption - I doubt FVEY itself coordinated the attack on Kim Dotcom. Nor is it the only such conspiracy - Sweden isn't part of FVEY yet eagerly went after TPB and Assange.
But pointing to such agreements is a good analogy for the similar ratcheting totalitarian trends we observe across countries - how intertwined the governments are, and how willingly they give up their citizen-subjects to each other. This is the larger issue - regardless of the actual mechanics of pollination, we can be sure that after the bugs have been worked out in Australia, we'll be staring down the same exact bullshit in the US.
(And I do apologize for blowing up a thread about Australia with US centrism. The point is that we, the people, are ultimately all in this together. Looking to US-exceptionalism as a reason to write off what's happening in Australia as their own problem is a broken outlook)
That's funny, the only exceptionalism I feel we've exhibited for a while is our exceptional ability to bury our heads in the sand and deny the existence of all the inconvenient problems we have to address in the future. :/
Each nation in question has different protections, or lack thereof, when it comes to privacy, speech, property rights, et al. One size will not fit all, each country would see a different response to the same attempted legislation. The US Government has tried for two decades - with very little success - to reach for something equivalent to what Australia just rushed through in no time at all. What would completely rewrite so much US law and interpretation so rapidly as to make such a drastic change possible in the US anytime soon? Nuclear terrorism, as a society shaking event, is about the only thing that comes to mind as plausible and that's far-fetched.
USG basically tried once to mandate backdooring encryption itself - in the 90s, when the entire topic was only relevant to a small community, there was basically no low level "street crime" involving encryption, and doing so required restricting individuals' distribution of software.
The renewed push is based on telling commercial companies that they have to setup their systems to assist the police, completely in line with precedents like CALEA. The much more diffuse tech-using community is already primed for heavy handed authoritarianism based on how these companies already operate, and also in general due to being pumped full of the terrorism by the 24/7 "news" cycle. I'd hope you're right that the US has constitutional protections to backstop this, but from my perspective those "protections" serve more as coping mechanisms rather than as effective restraints on government power.
I can perhaps see a legal exception for US Free software devs who aren't working commercially, but I can just as well see a malinterpretation declaring them as engaging in commercial activity ala Wickard v. Filburn.