I always thought the distinction was whether you are accumulating money (saving) or accumulating assets that are expected to appreciate in the money you intend to cash out in (investing). Or something like that.
USD is money. So I'd save in USD, not invest in it. The S&P500 is an asset. I'd invest in the S&P500, not save in it.
BTC is also money. So I save in BTC, not invest in it.
BTC is seen as an asset in many countries, that's why you pay capital gains tax for what you earned in your investment.
BTC is also money because you can pay goods and services with it, so you can save it as well. This is specially true in El Salvador where you don't pay capital gains tax because it's legal tender there.
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Well… you can actually invest in Bitcoin, or invest with Bitcoin in something else
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