You can leak memory in perfectly safe Rust, because it is not a bug per se, an example is by using Box::leak

Preventing memory leaks was never in the intentions of Rust. What it tries to safeguard you from are Memory Safety bugs like the infamous and common double free.

I’m not sure if you are referring to this, but I’ve noticed some people overriding their comments after around 24h they have posted them - probably running an automated script. I assume they are doing it for perceived privacy reasons.