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.
The big problem is that we have long stepped over that line.
Now even when you pay you are still shown ads (maybe, but not surely, not-targeted) and your data is still scrapped and analyzed to hell and back.