It seems to be the direction the law in Russia is headed.
https://www.rt.com/russia/489336-russia-law-prisons-cryptocurrencies/

Others are suggesting some countries could make it illegal to invest in gold.
https://www.marketwatch.com/story/stashing-some-gold-heres-why-that-could-soon-be-illegal-according-to-one-notable-hedge-fund-bear-2020-05-20