Recently there was this too (made quite some noise on social networks) : https://www.androidpolice.com/2019/05/08/kiwi-browser-remove... Ok, this story is more about Google Play Store but I feel like there is maybe (in my opinion) some conflict and abuse of dominant position here too. Felt like it was relevant will all the other Google stories in the last days (Nest for ex.)
I see that there's a repo on GitHub: https://github.com/kiwibrowser/android
But the status of the code is unclear (the readme just says it's unsupported), and the last public commit was months ago while the app on the Play Store (having been restored) was updated much more recently.