Bluesky is a great project to learn from. Their investment in infrastructure paid off with big growth and a great UX. They have become more open over time. #nostr still has the potential if it can "out-open" them, by transitioning from a 1 person hobby project to a completely open, transparent community (work is ongoing there). Then use bluesky as market research of what is possible with great infrastructure, great ux, great content, and great growth (where nostr is lagging).