Earlier quoted context omitted.
Au contraire, AWS has a stable of foundational services that have not moved in a long time and a worthwhile knowing, no matter what service-du-jour gets rolled out. Not a moving target at all.
The cert expires in a couple years, and you have to get it again, with some new stuff added though.
Azure is the worst offender, offering certs that expire in ONE year. No thanks.
Google certs expire after 2 years.