The most sensible option is offering anyone who gives you not their bank account, but a number like the Mexican CLABE or the European IBAN, which are safe to re

The most sensible option is offering anyone who gives you not their bank account, but a number like the Mexican CLABE or the European IBAN, which are safe to receive money. This implies that you will need to transfer some of that money to different countries, losing part of it to commissions. Even you had enough money to cover administrative expenses, people with more than one bank account, or the ability to generate more of these numbers, will get more than one dollar. And don't even think about crypto, that would only add another layer of abstraction to the donation. As PC says, it's best to direct that money towards maximum impact, than diluting its effect among everyone.