As an "old-school" sysadmin I have the opposite view: it's difficult to find jobs that don't require AWS these days.

I know perfectly well how to provision and scale a large infrastructure and can give you 99,999% availability in any application, BGP if needed.

Yet no one is interested in that. Sure I can write Ansible scripts and Terraform policies, but it's a miniscule part of my skillset and doing it on AWS is just boring compared to building the backend that powers it.