Why call Affine Open Source?

[zerodarkzone]

I’ve noticed that while AFFiNE markets itself as a fully open-source Notion alternative, the backend architecture relies on a custom source-available/enterprise license rather than a standard OSI-approved license.

In past articles and discussions, AFFiNE has critiqued other workspace tools like AppFlowy for using Open Core models. However, AFFiNE appears to follow a very similar dual-licensing structure (open-source frontend editor, source-available backend server).

How do you justify claiming the "Open Source" title over "Source-Available" or "Open Core"? Isn't that just false advertising to claim to be an open-source notion alternative?

[darkskygit]

I think the official website page already makes it very clear.