Cryptocurrency is the only accessible donation method for many people.

Bank transfers, credit cards and Paypal exclude millions of people who don't have government ID (e.g. the state refuses to print ID for them) and pseudonymous donations aren't possible (many people need pseudonymity for safety or privacy reasons). In many countries, money orders, cash deposits and Visa gift cards also require ID, even for low amounts like $25. Cash by mail is rarely accepted as a donation method.

In comparison, Bitcoin and Monero don't require government ID. It's possible to buy cryptocurrencies with cash or gift cards or earn them via remote work. Cryptocurrency uses pseudonymous private keys, not state-assigned identities, as proof of ownership and is therefore accessible to everyone who owns or can borrow a computer or smartphone.

Only accepting KYC'ed fiat payment methods is anti-privacy and financially exclusionary. I commented on this here: https://meta.wikimedia.org/wiki/Requests_for_comment/Stop_accepting_cryptocurrency_donations and here: https://anarkiocrypto.medium.com/why-the-states-monopoly-on-identity-is-more-dangerous-than-google-facebook-and-microsoft-4ce415793d7e/