I'm not aware of any browser engine restrictions on Android / Google Play. If Electron isn't running on Android, it's probably because the Electron project has chosen not to do it.

But since there are restrictions on iOS, maybe it's less appealing to bother with Android? (You'd want to be able to say you support both mobile platforms, but you wouldn't be able to. And there wouldn't be a path toward doing that that's within your control.)