Okay, they're not getting paid. That's worse! This gives them an incentive to be the one to inject malware to steal bitcoins because they haven't been compensated for all their hard work.
So, of course, you stay far, far away from any open source software and their maintainders, since many/most of them don't get paid and are obviously nothing but one giant perverse incentive. Never use them right? Because we wouldn't want to think you're just a hypocrite dog-piling on someones bad day.