How many Rust compilers are out there?

That's not likely to be the case if Rust is found to have significant benefits with regards to safety and security. If that is accepted to be the case on any larger scale, there will be a serious market for maintaining forks that are validated through processes likes FIPS and such for use in restricted industries.

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In addition, for a long time the only Python compiler was CPython, and it's still the de-facto, to the point that many Python libraries only run in CPython, and switching to PyPy isn't free. And Ruby only had MRI. But that didn't seem to hurt their popularity.

JavaScript is a really weird outlier that is the result of really weird politics and history, so in my opinion it shouldn't ever be used to make a generalized argument (about anything).

It seems to me that as long as a language is open source, most people tend to not be worried about lock-in (since open source removes the incentive for lock-in, and forking is always an option).

And companies that are very worried tend to lock everything down to a specific version anyways (which is basically forking the language / tool / library).

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