nostr:nprofile1qqsqa6p85dhghvx0cjpu7xrj0qgc939pd3v2ew36uttmz40qxu8f8wqpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhsvcquqy what's the business model of free blossom servers like the default ones in Amethyst?