They are developing their own in-house solution for this called il2cpp - translator from IL to c/cpp, which then gets compiled natively for/on the target platform.
The first supported platform is WebGL, which should be available in 5.0 with iOS following afterwards.
That means that they should be fine with L/GPL latest Mono since they won't it even use it at runtime.
Unfortunately, they are bit slow; I expect fully working translation for iOS being available in several months at best
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