There’s a difference between source available and open source. For example, actually being allowed to distribute modified versions is pretty damn important:

Restrictions

• No Distribution of Modified Versions: You may not distribute modified versions of the software, whether in source or binary form.
• No Forking: You may not create, maintain, or distribute a forked version of the software.
• Official Distribution: Only the maintainers of the official repository are allowed to distribute the software and its modifications.

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Because half of us host an instance lol