Google is not requiring you to pay for an account. Even if they were, you could still complain that this is not "free without an active internet subscription", or "free without owning a device that can connect to the internet", or "free without taking up 5 minutes of my time".
After you click the button to try it...
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I have the same thing for articles where I click on the submission title and there's a paywall. I want to know about the wall before I get there so that I'll know it's not worth the effort. Usually this is achieved by looking in the comments for an archive link so in that case I don't care about there not being a warning in the submission title because the comments allow me to enjoy the content anyway. In this case there's no need for a warning in the submission title because I go to the website and I get a neat idea, that's fine, no wall yet. There's a button to try it and that's where the warning should be that a Google account is required. Your argument is what's ridiculous.
See my other comment: https://news.ycombinator.com/item?id=42407232
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.
It asks you to first sign up with Google. Then it lets you sign in with your gmail address.