Nostr was started by an ex-ethereum developer. But he possibly leans more towards bitcoin now, though sometimes I wonder. The issue with ethereum was that they had a very large premine, which they also lied about. So, it's proprietary. Most people on nostr prefer the relatively non-proprietary bitcoin, to ethereum. In the same way that they prefer open source to proprietary solutions. That's not to say there is not innovation in the proprietary, but it can be often ported over.