Rust is not a product, never was meant to be one either, if you can point to $0.01 of income brought to Mozilla because of someone paying for Rust then I will be happy to concede that it is in fact a product.
Failing to me means that your product can not stand in the marketplace on merit. Underhanded - criminal at that - tactics by a competitor does not change that in principle. See also: Stacker, Netscape (hm, haven't we seen this before: browser company wants to be platform company, does a rewrite), and many other products that ultimately did not make it but had a very good run while they were alive.
Mozilla is confusing their own importance to staying alive as 'Mozilla the profit seeking company' vs 'FireFox, the last stand'.
And the latter to me is much closer to the stated mission of Mozilla than the former, no matter how much corpspeak they throw at it.