[goodpoint]

A lot of companies also contributed to Linux, but that's not the issue.

The concern comes from having a *small* number of companies with a notoriously aggressive behavior controlling a project.

Google is especially known for using products as weapons against competitors and drop them suddenly after a while.

[xiphias2]

Sure tying Rust development cycle to Azure+VS code, AWS or GCP would be quite bad (run rust-analyzer on Azure for example). At least Facebook doesn't have this kind of infrastructure yet.