The reason I refuse to work for Amazon is because they claim ownership of every side project you make on your own time, with your own equipment, just because you are employed there.
Sadly, this seems to have changed. Several years ago the policy used to be that what you developed on your own time was your own, and even if you used company resources and spent time while at work on "your own" inventions, they still belonged to you as long as it wasn't an excessive amount. For example, if you printed out something or used a copier, or did a google search at work, etc. It seems they decided that was too good for the drones though.
This isn't true. They own side-projects the relate to your direct job or that can directly compete with Amazon. If your side project is a compression algorithm and you work in website design, Amazon doesn't really have any right to your stuff.
It's actually a pretty standard invention agreement across tech companies.