You know a site like this can be entirely static and hosted for free with github pages, gitlab pages, netlify, vercel, or any other free static site host.
Notion users will be in for a nasty surprise when they realize that DO is closer to a Raspberry Pi than a OEM PC.
All you get is a barebones OS without a GUI. You have to set up everything yourself: server (e.g. Apache), language (e.g. PHP), database and SSL. This is a non-starter for people that have never seen a command line interface before.