Bluesky Unveils $8M Seed Funding and Innovative Paid Service, Custom Domains

If they're aiming to build an open source ecosystem, without selling user data and thus not being over-reliant on advertising, then why they chose to use their own protocol instead of ActivityPub? In what way their philosophy differs from Mastodon so to make sense of that?

Blue sky is intriguing. I’ve been using mastodon but may need to give blue sky a shot also

Been enjoying my time in bsky so far!