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This is correct, they released the source code a couple years ago under a reference license.

https://blogs.unity3d.com/2018/03/26/releasing-the-unity-c-s...

https://github.com/Unity-Technologies/UnityCsReference

The reference source is pretty much useless for anything directly under namespace `UnityEngine`, because it consists mostly of forwards to C++, and the C++ was never released.

At least that was the case around 2018. It might be getting better as Unity is migrating away from C++.

This is only the C# source code, the internals of Unity is a closed C++ codebase which you can pay $1800/yr for access to

If you can't afford $1800/yr you weren't serious anyway.

That number sounds like BS. If it was that low (per-seat even), every serious team would have source access.

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