What specifically do you think AGPL runs afoul of in the open source definition?
I do see a paradox of saying you're free to do what you want with software and then adding responsibilities as GPL does, but as far as being open source, you are free under AGPL to use it for any purpose, modify in any way, etc, you just have to share what you do under the same license, so I don't see why it wouldn't qualify.
I wonder whether a license is a valid FOSS license, if it requires users to share works they created with it (like a FOSS PhotoShop but any artwork edited with it must be licensed under Creative Commons).
Thanks for clarifying, I hadn't heard of that license before. It's interesting to see it is classified as "extreme copyleft" (on wikipedia) and is apparently so extreme in what it asks you to share that it doesn't qualify as open source, nor is it recognized as free software.
I do see a paradox of saying you're free to do what you want with software and then adding responsibilities as GPL does, but as far as being open source, you are free under AGPL to use it for any purpose, modify in any way, etc, you just have to share what you do under the same license, so I don't see why it wouldn't qualify.