I don’t know where you’ve heard this, but none of it is true. Rust is definitely used for low-latency trading, and that’s actually one place where it really shines.

sharing memory addresses across code intentionally having the same address written to and read from across threads. Something rust is sort of designed to not support.

C++ does not “support” that either. C++ will let you write that code, but if you write code like that in C++, it’s undefined behavior and trust me, no low-latency trading firm wants undefined behavior in their trading software (just imagine what could go wrong…).

Rust helps you avoid such issues. However, Rust definitely “supports” undefined behavior in the exact same way. If you want to share mutable pointers across threads and you don’t give a crap about undefined behavior… I mean, that’s really, really stupid but you can just write unsafe and then you can do exactly what you can do in C++ as well.