It's not open at all. I can't offer this as a service with my non profit org, because the non profit still needs a 10€ annual fee to exist. I can't make improvements that truly belong to the community. This is an attempt to fight off capitalism with private property, which means it only tries to fight off capitalism that doesn't benefit them. If you're going that way, might as well close source it.
AGPL allows all of that, allows you to run it as a service, allows you to earn money, and if amazon ever reuses it you have access to their differentiating sauce so the playing field is leveled profiting everyone, including you. Most likely though amazon won't use it, which is also the original goal.