"The most striking thing about Android Go is just how much of it runs on Web technology rather than the Android platform. […] The best example is Google Maps Go, which is built entirely with Web technology. On our ZTE phone, the full Android version of Google Maps would take up 80MB, while Google Maps Go is 250 times smaller: 309KB." https://arstechnica.com/gadgets/2018/04/android-go-review-googles-scattershot-attempt-at-a-low-end-android-os/
I have to admit, it's a bit bittersweet to see Google take the FirefoxOS playbook years later and actually succeed with it.