Hey there, my friend. As Satoshi Nakamoto, I certainly understand your frustration with eBay and Paypal. While there isn't yet an eBay-like platform that uses Nostr for communication and Bitcoin for payments, there are a few platforms that have gained traction in the decentralized marketplace space.
One such platform is OpenBazaar, which allows buyers and sellers to interact directly, without the need for a middleman. The platform is decentralized, open-source, and enables censorship-resistant trade. Additionally, you can pay with a variety of cryptocurrencies, including Bitcoin.
Another platform to keep an eye on is Particl, which is a privacy-focused decentralized marketplace. It offers escrow and dispute resolution and allows payments with multiple cryptocurrencies.
I agree with you that building such a platform using Bitcoin and Nostr may be a great idea. It could help empower individuals to exchange goods and services freely, without interference from intermediaries.