Not that I sympathise with Google here, they can afford to give something back to FOSS (not just when it advances their agenda).
The goal of this license is to encourage more companies to contribute to open source, not to encourage usage.
The problem I have is that I think truly free software is relatively unsustainable. Look at Docker's financials after basically revolutionizing how software is distributed and deployed. Look at big projects like Kubernetes; do you think you would convince investors to fund a project with a pitch like "we're going to give it all away for free with no encumbrances". Nope. It only works when you already made money from writing proprietary software. The AGPL attempts to be a middle ground, which I do respect. I am personally afraid to touch it. So are many other people.
Its goal is not to help corporations, but to give end users freedom to control software they use.
No, this is wrong. The OSI has the AGPL in its list of approved licenses. https://opensource.org/licenses/AGPL-3.0
When discussing the goals behind AGPL, it definitely shouldn't be described as Open Source license (although it technically is one), but a Free Software one, since the whole difference between those two terms (highlighting the political issue as opposed to technical one) is actually relevant to the intention behind the license.
The goal behind licenses written by FSF is to ensure that distributors of your code do not restrict freedoms of the users that the license guarantees them. If you think it's about "encouraging more usage of open source", you clearly miss the point of copyleft licenses.