Depends on why you want an open-source license in the first place.

If it's to bait in companies to use your product and then offer more features under a proprietary license, then something that's more attractive to companies like a permissive (corporate charity) license is a better choice. If it's to ensure that everyone who uses the software can contribute to the development, something like the GPL or AGPL is better.

There can be other reasons to pick a corporate charity license, of course, but encouraging corporations to use your software is certainly one of the most common.

Because AGPL is open source and not proprietary, that's the reason. Open source doesn't necessarily mean that anyone can use it as they please, they must abide by the terms of the license. If they don't want to, then they can find another project, or get a different license for it.