[ascetone]

It doesn't.

AGPL means the only people using it have to licensed the same.

[jgreen10]

Well, people use MongoDB...

AGPL only requires open sourcing any modifications you make to the software when you give users direct access to a server running the software, which seems like something you would never want to do in case of a database.

You can use database servers running AGPL software in a closed source SaaS: http://www.gnu.org/licenses/why-affero-gpl.en.html

[reitanqild]

MongoDB used to distribute drivers under a more permissive license for this exact reason IIRC.

[jgreen10]

Well, applications that want to use Citus can just use whichever PostgreSQL client is available.

[reitanqild]

Thanks, twists my head but as far as I see it could work.- IANAL