It's anecdotal, but most of the Rust projects I see posted to Hacker News are new projects. Relatively few are existing C or C++ projects that are trying to por

It's anecdotal, but most of the Rust projects I see posted to Hacker News are new projects. Relatively few are existing C or C++ projects that are trying to port gradually to a new language but those exist too. That said, there is definitely a class of projects that are aiming to replace popular command-line tools with Rust replacements. In many cases, these offer much of the same functionality, but use Rust to increase parallelization or take advantage of the high performance library ecosystem.