What if the governments across the world attempted to seize all of your crypto assets like the US seized all gold from their citizens in the 1900s. Now I'm seeing articles talking about how the US government is trying to be able claim private property.
I think that ultimately this would be very challenging for any government to successfully accomplish. This would cause a revolutionary period again in our world I imagine....
If it were to be tried, I would not be surprised if it actually accumulated quite a lot of coin (at the cost of people's livelihoods, either temporarily or permanently) since a lot of people I bet would hand it over without a battle or have not taken the practices of being able to keep it safe. Whether or not that would positively effect the government financially in the overall scheme of things is another story as well. I think it's pretty unlikely that this would ever happen. I wouldn't say impossible based on the example that you provided about what happened in the 1900s though.