Because the world needs SN.
Theoretically, the quality of content and community should be better with SN than the trash that is reddit, X/Twitter, facetrash, etc. in practice that is true, but the difference is not yet as pronounced as I had expected by this point in time.
The network effect is so much stronger than I would have imagined, but the SN metrics show steady growth over time.
At some point I expect SN to be the place to be. Or at least, force the others to add Bitcoin monetization for user generated content.