I am an author and I do both Amazon and my own distribution through my web with woocommerce and @btcpayserver. When people buy from me directly, they get the files without any DRM bullshit. I try to turn off any DRM where I can (for example Apple allows authors to opt out from DRM and give customers pure epub). 

Also even people get the ebook from me, I get to keep 100% instead of 30% through Amazon. But for me it is more important that my content gets to whoever needs it, and Amazon distribution is what many people prefer. It's one click buying and have it in your reader user experience is great and people like to do things the easy way. It removes friction. But it is the infamous turkey problem.