If you just want to donate to a private tracker and limit the paper trail, see if they accept XMR (Monero). If they do, buy off an exchange, send to your XMR wallet and then pay with that. Monero is designed to be untraceable so only the person who initiates the transaction has the key to decrypt the details for it… meaning people can’t snoop on your transactions. https://www.getmonero.org/get-started/what-is-monero/