In terms of how to run a tech foundation, no (former) employee of Mozilla has any standing to talk. Mozilla has watched Firefox market share evaporate, laid off core tech teams, all the while increasing the pay of their leadership.

I am completely willing to give Amazon the benefit of the doubt, and let them be involved in the Rust foundation as they see fit.

The great thing about open source, is that the code is open source. If enough developers don't like the way stuff is being handled, they are free to fork.