In the Bitcoin community, to prevent exchanges from backstabbing users, the tax avoidance strategy is very simple:

1. The account KYC is for an elderly person in Africa, so it's unlikely that tax authorities in other countries will get data, and it's even less likely to penetrate.
2. The account KYC is for an 80-plus-year-old family member; unless the amount is huge, they won't trace where the money ultimately flows.

But the premise is not to offend people or have amounts that are too large. These days, having a large amount is considered a sin.