Your examples are all incomplete. They all need "until people with badges and guns shut them down" or "until they need to deal with off-chain assets that require trusted reliable oracles". It is ludicrous in the extreme to assume that some blockchain transaction can and will remain anonymous and outside the enforcement of laws.
A country with repressive or non-functional capital/monetary controls will just jail people using cryptocurrencies unless they turn over their wallets. They can also use an accusation of having a wallet as pretext for indefinite detainment or punishment. Such countries aren't likely to have functional governments or even free access to the Internet. Even TV and radio are tightly controlled in such places.
- Sex workers from countries where prostitution is absolutely legal are affected by, e.g, Mastercard pushing for blocking transactions and almost forcing OnlyFans to drop all their adult content. All because of extended overreach from American politicians.
- A lot of these countries with strong capital controls have a lot of loopholes in the legislation by design, so that the elites can find a way to move their capital while the middle-class is forced to carry all the burden. There is a saying from a Peruvian politician: "For my friends, everything. For my enemies, the law", which perfectly illustrates the situation.
Crypto is not illegal, it just democratizes these loopholes. If History can teach any lesson, whenever the middle-class finds a way to enjoy the same privileges as the elites, it does not end up in a repressive reaction from the government, but in the normalization and formalization of the "informal" behavior.
- Same thing for holding stabletokens. In Brazil there is no regulation against holding crypto. The problem is that Forex is not something for retail. Too many fees, taxes on fiat and the impossibility of making deposits in foreign currency make it difficult for "retail investors", but a lot of elites have access to external markets where they can hold USD/EUR/GBP to protect themselves.
I could go on... but the point I am trying to make is that in the places it doesn't take an extreme case of Authoritarianism or Poor Economic Development to face a situation where the institutions fail.
A country with repressive or non-functional capital/monetary controls will just jail people using cryptocurrencies unless they turn over their wallets. They can also use an accusation of having a wallet as pretext for indefinite detainment or punishment. Such countries aren't likely to have functional governments or even free access to the Internet. Even TV and radio are tightly controlled in such places.