In the US at least, the method for seizing crypto is the same as for seizing money in a bank account. The only difference is that the warrant is served on the person who owns the crypto wallet instead of a bank.
That’s what I meant when I said the cost to seize your money goes up if you’re willing to defy a warrant.
However, if using crypto as a currency becomes mainstream, governments will crack down.
Crypto might be decentralized, but governments could easily require registering wallets, and force businesses to only transact with people who are registered.