And then? Does government ever say "oh, nevermind"? After a couple of notices your bank account will be frozen, or your passport "revoked" etc.

If you never intend to pay your taxes the government can garnish your wages. The individual state governments are far more vigilant about this than the federal government, however. California will dip into your Wells Fargo account almost immediately but one can not pay federal taxes for quite some time. You occasionally hear about some celebrity or fiancier getting busted for not paying their taxes for the past 20 years. Your passport is never revoked, though. Congress has tried to get a bill to do that but it has never passed. Certainly "men with guns" do not show up at your house if you miss the April 15 deadline as seems to be suggested in these ridiculous discussions. This is a country where at least half of the government officials themselves also hate taxes and dodge them as much as possible.