Open Source but not actively accepting contributions is not a great place to be. Especially when you can't federate, so you are stuck using the central server which basically doesn't accept code contributions. Take a look at https://merge-chance.info/target?repo=https://github.com/sig...

Also it is somewhat interesting that this Open Source centralised Signal server, where centralisation means you can move quicker, hasn't seen a commit in 10 months.

Compare it to Matrix Synapse https://merge-chance.info/target?repo=https://github.com/mat...

The story with the flagship clients in both spaces is very similar.