Gold and physical assets can always be seized by governments, as they have been in the past. Just look at the U.S. and Executive Order 6102 signed on April 5, 1933, by President Franklin D. Roosevelt forbidding the hoarding of gold coins, bullion, and certificates. Cryptos can't be seized if stored properly. However they have another set of problems with power supply and the internet; but those aren't as likely to be used against the populace since almost everything needs energy to function and shutting down the entire internet is highly unlikely.