Protocol that hide sender

Hey everyone!

I’ve been learning about zero-knowledge and recently came across stealth addresses. They seem like a great way to protect the receiver’s privacy, but I’m wondering about the practicality of handling small transactions.

For example, if I use stealth addresses for donations, someone might send me $5 worth of ETH. The problem is that the gas fees to transfer those funds back to my main address could be higher than the actual amount received, making it effectively unusable.

Also, while stealth addresses protect the receiver, I think it would be great to have a protocol that protects the sender’s privacy. Does anything like that exist?