Yes, they can do their own thing without having to worry about their pesky users. In reality, this means that when you consume somebody else’s service and you need something changed, you have the choice to either hack up your own thing or somehow convince the service team to put your needed changes on the backlog. From my experience you often end up with everybody implementing some version of what the official service is supposed to do because the service can’t be bothered to make the changes within a reasonable time frame.

I would do micro services only once the requirements are very stable and there is a clear need for scalability. Microservice first architecture is a recipe for complexity.