if bitcoin could help these countries go around the sanctions and help with their transactions then it would have made some sense to me but since it can't (being small and too volatile) i don't think it is plausible.
Why? The volatility as risk, in exchange for going around sanctions, is worth taking in my opinion. Plus what does "being small" mean? The capped supply?
if you buy a game worth $10 and price goes down from $10500 to $9500 the seller loses $0.95. but when you are making a gigantic trade like selling oil per barrel per day worth $50 million for example, the same price drop means the seller loses $4.76 million. same goes with case when price goes up. and that what volatility does to large transactions.
similarly you can "convert" $10 to and from bitcoin, even $100k or $1 million one time but you can't do the same with something like $50 million every day. the market isn't even that big to absorb that much. (just now it took only ~800
BTC=$8mil to push the price below $10k again)
besides if accumulation were the goal of the governments then they could have simply impose new tax laws on anybody who owns bitcoin to pay a portion of it to the revenue services, that way in no time without any cost they would accumulate a lot of bitcoins no matter what the price of it is at that time.
How many people own Bitcoin, and how much do they own? How can the government prove, and will the people declare it?
Better to tax people in fiat, and use that to subsidize Bitcoin buying/mining.
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all they need to do is to regulate exchanges and force them to give a list of all transactions every user made. now it is not up to the "people" to want to pay their taxes or not, if they don't they are evading and that is illegal and can have jail time.