[rossng]

This is a dark pattern. Why would you want the default to be a compiler that essentially spies on your code? I can think of no better way to make developers (not to mention businesses!) uncomfortable with the idea of adopting Rust.

Thankfully, Mozilla is one of the few entities left in the technology industry that seems to care about ethics. I don't believe the Rust team would ever do something like this.

[zzzcpan]

No, it's not a dark pattern, you have a clear choice, just one being less advertised than the other one.

And Mozilla is the one with opt-out of all of the unethical features in Firefox. They have no ethics, looking like they care about those things is nothing more, but PR. After all, corporations are not people.