That doesn’t apply to small amounts below $10k

But, again, the same applies. I deposit btc or cash into a bank, even $50k, then I disclose its source to the authorities, with the paperwork. But by using a privacy service, I can comply with the law and protect myself from malicious actors

Go open a bank account right now and try to deposit a briefcase full of $50,000

I’ve done this. They ask you for the paperwork documenting the source of the funds. Just follow the process. It doesn’t matter if its fiat or crypto.