> It has for Amazon, Adobe, Microsoft, Google and the Linux kernel.

I don't think so. I don't know about Adobe, but it's not a meaningful statement for the rest. Those companies default to writing safe code in languages other than Rust, and the Linux kernel defaults to unsafe code in C. BTW, languages favoured by those projects/companies do not reliably represent industry-wide preferences, let alone defaults. You could certainly say that of the two languages accepted so far in the Linux kernel, the only safe one is Rust, but there's hardly any "default" there.

> It remains to be seen which big name will make Zig unavoidable.

I have no idea whether or not Zig will ever be successful, but at this point it's pretty clear that Rust's success has been less than modest at best.

While certain teams within Google are using rust by default, I'm not sure rust is anywhere close in scale for new lines of code committed per week to c++.