[dromtrund]

I assume they read the code that tries to parse the data, and come up with formats that don't fit. If the code is open, they don't need accounts to see it

[developer92]

they need one to contribute changes though

[rad_gruchalski]

The system that implements breaking changes is not the open source system. The open source system attempts to be compatible with the proprietary system. That is what it sounds like.

[ZWoz]

They don't contribute changes. Server and official client is maintained by Stockholmsstad contractors. Open source project is alternative client, not full solution.

[LocalH]

They're changing their own code, not the public code in question. They're not submitting pull requests.