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But they forked a Matrix server as well to limit it to a standalone server and to limit who can access what information for the reason of privacy of the kids.

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(They likely didn't fork it to make it standalone, you can do that from the config. The article doesn't mention that as a reason, either.)

They changed the login, so that you can't use anyother client.

They changed the contact possibilities, so that conact can only be made on invite only.

I read an interview with the responsible vicr-principal of the school today [1]. From my understanding the only created QR Codes that included login and password (minus last 4 digits) and the client used this info to send the request to a standard matrix server. The users only had to type in the last 4 digits manually.

Everything else can be configured via the matrix server config

[*]https://www.golem.de/news/matrix-grundschule-forkt-messenger...

Doing that is supported in synapse and just a matter of setting federation_whitelist = []

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