I get the joke, but in ideal world, in microservices, there is no such thing as code duplication across services. As a maintainer of a service, I should not give a crap about code present in some other service - it's some other team's code, why would I care? I don't have to even know that the other team exists. In big systems, it happens that I can't even feasibly know the existence of all the applications.
In [an] ideal world, in monoliths, there is no such thing as code duplication across subsystems.
You mean you don’t have 300 versions of your badly developed rapidly evolving platform services rotting away underneath the bit you didn’t duplicate?
I don't. Other teams - maybe they do, maybe they don't. Who cares, not me. I have responsibility for services of my team, I think we are doing a good job.
Being selfish is the core principle of microservice architecture.
Until half your company gets laid off and you have to adopt other people’s shit.