The maintainer gave their work away for free. By definition - and by explicit license it isn't worth any wage, much less a "living wage many times over."
The maintainer wants to have their cake and eat it too - they likely believe in FOSS for moral reasons yet consider it immoral when companies take their software and use it freely under the terms offered.
If you want people to pay you for your work, don't give it away for free. If you give it away for free, don't have a temper tantrum if someone gets rich off of your work without compensating you, because those were the rules you chose to play under.
The maintainer wants to have their cake and eat it too - they likely believe in FOSS for moral reasons yet consider it immoral when companies take their software and use it freely under the terms offered.
If you want people to pay you for your work, don't give it away for free. If you give it away for free, don't have a temper tantrum if someone gets rich off of your work without compensating you, because those were the rules you chose to play under.