From the email: "When we launched the Chrome Web Store 11 years ago, there weren't a lot of ways for our developers to take payment from users. Today, there is a thriving ecosystem of payment providers offering a far more diverse set of features than a single provider could hope to. Now that our developers have so many great options to choose from, we can comfortably sunset our own payments integration."

My takeaway: Google products & services exist to fill a gap until there's sufficient other options. As options increase, expect Google to "comfortably sunset" their solutions.