> historically they have never told my spouse about my affair
Have we forgotten Google Buzz? Google changed GMail to publicly list the people you email most. In one case, this de-anonymized a woman's blog and enabled her abusive ex-husband to stalk her. https://fugitivus.wordpress.com/2010/02/11/fuck-you-google/
This is IMO the most likely way that "bad stuff" will happen: not maliciously, but through privacy-invading misfeatures connected to pushing people to share more.
I think you DO have to know about those, or close analogs, in writing Rust. I like both C++ and Rust but I will rise to defend C++.
1. Exception safety becomes "catch_unwind." You might object that nobody cares about that, but major C++ codebases (Google, LLVM, Mozilla) don't care about exceptions; they are built with -fno-exceptions.
2. Move semantics in C++ are annoying, and so is the borrow checker. In Rust you get hit by things like "this code is fine here, but you aren't allowed to refactor it into a function" because there's no interprocedrural visibility into struct fields.
3. Meta-template higgery-jiggery is real and bad in C++, but has a mirror in Rust. With C++ duck-typed generics you write dumb code that does the thing, and then you can refine it with hilariously awful techniques like SFINAE. In Rust you're googling higher-ranked trait bounds before you can even write the thing. What does `for` do again? I think "strongly-typed language, duck-typed generics" is a bit of a sweet spot and C++ has lucked its way into it.
4. "30 years of cruft" means things like "I speak C preprocessor" which is practical. C compat is why C++ is both so awkward and so successful. There's no smooth ramp from C++ to Rust, the way there was from C to C++; that's a choice and maybe the right choice but it has a price.
Rust's "feature surface area" reaches or exceeds that of C++ through procedural macros, which surfaces the entire Rust AST to the developer. Major Rust crates like serde use this feature, and when it goes wrong the errors are actively misleading. I've personaly been bitten by this, it's incredibly frustrating to debug. https://serde.rs/derive.html#troubleshooting
Have we forgotten Google Buzz? Google changed GMail to publicly list the people you email most. In one case, this de-anonymized a woman's blog and enabled her abusive ex-husband to stalk her. https://fugitivus.wordpress.com/2010/02/11/fuck-you-google/
This is IMO the most likely way that "bad stuff" will happen: not maliciously, but through privacy-invading misfeatures connected to pushing people to share more.