Having it open source is undoubtedly better, however one can simply ask for the source as often people do. Snark just leads to people not bothering at all.
As the old expression goes, "open source is more than just source code".
Honestly --and I'm not trying to be snarky here-- in this case, I'm not sure I understand how "not bothering at all" would actually be worse. Maybe I don't understand something about the value.
There are people making comments asking for help on OSX so they might have a different opinion than you, but beyond that we also have to consider other members seeing these kinds of comments may decide not to bother. So yes, you don't care about this project, but you might care about other projects that may never see the light of day as a consequence.
Honestly --and I'm not trying to be snarky here-- in this case, I'm not sure I understand how "not bothering at all" would actually be worse. Maybe I don't understand something about the value.