So Campsite got acqui-hired by Notion, tells their customers in a blog [1] something along the lines: "Thanks for all the fish, you've got 2 months to migrate to something else.".
They could have open sourced it in a way which would have allowed customers to atleast maintain their own install. But instead they release it under a license which says "non-commercial". So even if you were to export your own data you can't even self-host it.
It seems to me rug pulls such as these are bad for the entire industry. Why would you invest in these kind of products if there is real chance you'll get rug-pulled?