It is a fragmented company in which anyone looking to stand out creates a whole new product. Once they've moved on the new team has no real interest and another cycle starts with them looking to create a new product to standout.

I can only assume something similar in AWS world since that thing is crammed pack with some new feature that tweaks something.

I cant really fault the employees, companies don't have much culture of loyalty anymore. May as well get in and get what you need before getting out.