Yeah, except Mojo’s license is a non-starter.
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If OpenJDK did not or could not exist, we would all be mega fucked. Luckily alternative Java implementations exist, are performant, and are largely indistinguishable from the non-free stuff. Well, except whatever android has going on... That stuff is quirky.
But if you look at dotnet, prior to opensourcing it, it was kind of a fucked up choice to go with. You were basically locked into Windows Server for your backend and your application would basically slowly rot over time as you relied on legacy windows subsystems that even Microsoft barely cared to support, like COM+.
There were always alternative dotnet runtimes like Mono, but they were very not feature complete. Which, ironically, is why we saw so much Java. The CLR is arguably a better designed VM and C# a better language, but it doesn't matter.
Dotnet was on a slow roll to complete obsolence until MS saw the writing on the wall and open sourced it.