Because the parent said "that many Americans lost money over". Plus the SEC is "protecting investors". So I'm asking, what if there are more people who've made money over those who lost? Does that mean life's good? Coinbase has been pretty transparent about their operations. Not only transparent, they've publicly mentioned several times how frustrated they are dealing with SEC, the organization that is slow to come up with various legal requirements for the cryptocurrency industry. In a way, Coinbase helps the SEC to raise their own bar.
We need systems in place where everyone can make trustworthy investments. If people can't feel safe (even if it's one person or many people), then our economy will slow down (see current crypto prices post-terra, ftx, and more).
This is like arguing we shouldn’t have deposit insurance because on guy made a killing on their short.
Why does this matter? Even if Americans are scamming foreigners (0 Americans losing money), that doesn’t make this legal.
The difference between aapl and coinbase is there is regulatory audits of the books and required publications about the health of the security. There are rules about insider trading and insurance protections if a brokerage mishandles your money (see Blockfi).