Sadly, this is how it works in many large social systems, left unchecked. The “reasonable consumers” drain the kind contributors until they cannot do this anymore. The curse of kindness strikes in software and other industries alike.
Why? My guess is that this new culture is promoted to extract free labor from hobby developers. Take for example, Github. It has a bot to close stale issues after a given interval of inactivity. But what if the issue was valid and unresolved? What's the problem in leaving it open for someone interested to take it up? But what GH wants to promote is a culture where open issues are considered as bad performance on the maintainer's side. It indirectly prompts the maintainers to take open issues too seriously.
Well, also a lot of people get into FOSS for altruistic reasons. They want to pay it forward and make the world a better place.
For these people, applying good operations principles allows them to more efficiently do good -- just like it allows a commercial company to deliver more end-user value for lower cost.
Running an efficient operation in FOSS isn't necessarily bad. Sometimes it takes an obligation viewpoint to get there. It can be unhealthy, but it can also give us crazy levels of neat software, as we see proof of daily.