Even if I'm pissed off with this particular incident since I was working on a project using this great library and I was scared by the little snowy button :) ... but I agree with you those people are doing it for fun. I used too but lost interrest in working for free. A lot of companies are making a ton of money using (among many others) my OSS project. Even my current employer (big if not biggest European software vendor) is using it on a major product they're selling for millions the funny thing is that they don't even know and prohabiting employees to work on open source even in their own free time.

This particular experience make me understand that working for free on open source is really a foolish idea. I was tempted by changing the license but since there are many others using it to build their business I thought it's better to just keep it as it is by respect to early adopters and users which any project is nothing without them.

For a healthy open source project the work needed it's not fun at least for me, it's not just about hacking/problem solving/design, you need actually to do issues triage, answer questions, documentation, extensive testing (with whole infrastructure for builds/releases/communication) those are not fun activities and in most cases done better than paid softwares (because people are passionate about their projects) and in addition to that I need to work fulltime on different (shitty) things to pay the bills and have time for familly ...