Monero can be seized too, sorry to say.
Discussion
if you keep that private key in a drawer or frame it on your wall, sure.
And how does that differ from Bitcoin?
Monero is way more resistant to this
Bitcoin is trivial to verify the amount of money in an address, if it moved, and if an address has been receiving money to begin with.
More anonymity + privacy = more difficult to apply censorship and confiscate