Earlier quoted context omitted.
Contrary to the downvotes on the above comment I see absolutely zero issue with wanting to be informed of this in advance. I would've made this exact same comment if I had run into it myself.
You would be informed of it when you click on the button and see that it requires a Google account...
As an example: I recently bought a piece of software for my new Mac that I had good experience with some years ago, only to find that it's not compatible with the newer models. Upon contacting support about it, this is a known issue with a whole support article written about it. However, it wasn't mentioned anywhere on the landing page or buy pages. They're working on a beta that will warn you (still after you've already installed the software) if it's not compatible with your machine, but again... if I had known this I would not have purchased in the first place. I feel tricked, and upset. This is the same type of feeling.