I heart-fully disagree. Being professional crosses the bounds of paid work and unpaid work.

It doesn't take much work to not leave a gigantic pile of trash behind you.

If anything, it's an even more a self-responsible thing to do in the OSS world, as there isn't a chain of command such as in the corporate world, enforcing this.

It's selfish to engage in group relation with other people building something without the conscious decision of continuity.

A job worth doing is a job worth doing well. Maybe I'm just a gray beard with unrealistic expectations, or maybe I care about quality.