Yes it is. Bluesky’s app and services is open source. With plenty of people crossing over to it, reason being because it resembles Twitter pre-Musk. Mastodon

Yes it is. Bluesky’s app and services is open source. With plenty of people crossing over to it, reason being because it resembles Twitter pre-Musk. Mastodon is also open source but never held or got even near the #1 top spot ever, and I don’t think it ever will due to the friction of choosing a server. People nowadays expect familiarity. ‘Don’t make me think’ that is why people aren’t going to Mastodon. As for Threads, it isn’t open source and are now introducing platform decaying features like ads which will make the platform worse. So I can say (at least for now) Bluesky is currently the platform of choice right now.