Very cool! I didn't know about Wildland, thanks for linking. I need to look into the architecture of Wildland to answer your question in more depth about the differences, but yes: there are certainly a lot of projects tackling data sovereignty on the web! Hopeful there's a bright future ahead for users online!

Privy is indeed backend agnostic: you can plug our API into any stack and we're building integrations for various languages/frameworks as we go! If you have a specific stack in mind, would love to chat :)