I didn't really think about it like that, though i guess accurate. Matrix, the spec is open, and synapse the server is open. anyone can make a bridge, they are

I didn't really think about it like that, though i guess accurate. Matrix, the spec is open, and synapse the server is open. anyone can make a bridge, they are pluggable, and the author can choose their license. I guess you could call Matrix+spec the core.