There used to be one, but it was shut down. IMO there shouldn't be an 'official' instance, users should be evenly distributed across instances and everything should be decentralized. The same goes for Mastodon or Lemmy, having most users concentrated on mastodon.social or lemmy.ml is not good. Centralization is pretty much always bad, but it's the only model of how services on the internet work that new users coming from centralized platforms understand. It's sad and unfortunate, but we might be able to change that. The more terrible decisions are made by corporations, the more successful will free and open source, decentralized software be. We saw it with Mastodon when Musk bought Twitter, we saw it again with Lemmy when Reddit was fucked by spez.