I think that folks that are asking Steve for more details are not being unreasonable. It came as somewhat surprising to me (and probably to most folks who are not involved with the core/admin side of Rust).
However, I also think that his tweet might be more in the pre-emptive vein of "cease and desist" leveraging his personal standing in the community instead of actually getting into a war with Amazon's side. The objective seems to be basically to let them know that if they continue with their current behavior, it will be met with resistance. He is taking a risk though because we don't know enough to have an informed view of the actions that might have triggered this.
However, I also think that his tweet might be more in the pre-emptive vein of "cease and desist" leveraging his personal standing in the community instead of actually getting into a war with Amazon's side. The objective seems to be basically to let them know that if they continue with their current behavior, it will be met with resistance. He is taking a risk though because we don't know enough to have an informed view of the actions that might have triggered this.