only one

not to discredit you, but how do you know?

@Markchous Can you launch multiple instances of your application, of a Service and more? No. Neither can the Google Play Services, and that's the point of having it, to share resources, saving RAM

@louiscad That’s a good point. My gut feeling is that it’s a single instance, but they could easily spawn multiple processes if that’s the case

In Android, apps are single process only by default, an the only way to have multiple process is to specify a process in the

AndroidManifest.xml

file for a component like a service or an activity. That means all the possible processes that can run (if any non default is declared) are known at install time.