I wasn't saying you were shilling to dodge competition so much as better performance is in your marketing material like many others. ;) I agree that a lot of the space they should be targeting won't have a humongous difference between a well-tuned GC and a typical, native implementation. You're right on that.

"Companies that sell ultra-low latency GCs for a fraction of the cost it would take for enterprise shops to adopt a language like Rust, are, well not exactly on their way to the Fortune 500"

That's a good point. Switching costs would be huge in many of these organizations. They'll make better inroads with something within their existing stack (typical) or doing new projects in the improved language (also typical). They're not rewriting all that stuff, though.