Because at this point it's a well known API. I bet people want to recreate AWS without the Amazon part, and so this is for them.
Which, to your point, makes no sense because as you rightly point out, people use S3 because of the Amazon services and ecosystem it is integrated with - not at all because it is "good tech"
Which, to your point, makes no sense because as you rightly point out, people use S3 because of the Amazon services and ecosystem it is integrated with - not at all because it is "good tech"