Building a web backend with C++ is a very dangerous and complex ordeal, you're extremely likely to expose memory based vulnerabilities to the entire world.

Web backends in Rust and C++? Not saying web frameworks in these languages don't exist but to claim they're anything other than curiosities is misleading. In any case, good luck with the fraction of a millisecond such languages gain you while waiting on database i/o. There are use cases for switching to a compiled language like Rust or C++. Web back-ends isn't one of them.

> It is worth comparing any two languages and ecosystems if they are used for the same things, in this case -- web backends.

Right I see your point, but in this case it’s about Ruby, the language itself, not RoR.