Does Microsoft make you think computer OS? Does Apple make you think of computers and personal devices? Do common names Alexa/Siri mean anything specific to you?
None of the words used in those examples have anything to do with what they do, but they are now synonymous with everything you think of when those words are spoken/written. That's because the companies have spent time developing them as brands. AMZN through AWS has just come up with names so that they can be discussed more easily. They haven't really spent time with ad agencies running lifestyle campaigns for them.
I also think it falls into "I don't use something enough to fully remember what it does". However, is anyone reading this really not aware of what S3 does? EC2? Those are the basics where pretty much anyone starts with. Sure, not everyone will need EKS and it becomes more esoteric, but people that do it day-to-day know exactly what EKS is.