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A comment on Things you can’t do in Rust (and what to do instead). Parent comment

Re:Things you can’t do in Rust (and what to do instead) by golergka on Saturday May 15, 2021 @09:56AM (#27165277)
> However, when you get to millions or billions, maybe you have to optimize and create a backend. What should this backend be written in? Previously the answer might have been C++. But now it's Rust.

Neither Facebook, nor Instagram or Slack are primarily built on C++ or Rust though. And many other products that I can't as confidently remember from the top of my head aren't.

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Re:Things you can’t do in Rust (and what to do instead) by est31 on Saturday May 15, 2021 @10:36PM (#27170754)
Facebook originally did compile their PHP to C++ though. https://en.wikipedia.org/wiki/HipHop_for_PHP

Only later did they introduce Hack and HHVM, which compiles a PHP dialect in a just in time fashion. My point is that once you reach scale, and your computer bill becomes significant enough, you'll really want to use efficient languages.

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