It would be interesting to see how a government could even attempt to seize crypto assets. Would they send the army to hack into our wallets? And what about decentralized exchanges? They would have to seize the entire internet.
That is the reason why cryptocurrency especially Bitcoin was created. Because that is the best idea how to prevent them from being stopped by the government. While Wikileaks was still operating, there was a financial blockade on the WikiLeaks account. The government caused that.
After US govern initiated a financial blockade over WikiLeaks' accounts, Julian realized the potential of Bitcoin and intended to accept the new cryptocurrency as a form for donations. The idea put BitcoinTalk on flame at that time:
I think it's better to start reading the story of Julian's life now, and how he became connected to Bitcoin.
Source:
The call for Julian Assange || The WikiLeaks Manifesto - We all should read it