Please explain what game development is to me, then, because both people are creating paintings in your example.
Right now I'm just seeing a wide misperception of what game development actually is or can entail. There are people that work on games that never see a line of code, but they're still game developers. Same with people that only work code and never make any levels. Same with the modelers that rig and make a sword for their game. Same with the testers that ensure the game plays correctly and so on.
Nobody has yet to be able to provide an example of how money supposedly corrupts mod making but at the same time it's okay to angle towards getting a job, which means you're modding for the hope of money anyway if you're angling for a job. The incentive is the same, only the timescale is different.
Nobody has yet to explain why still having the option to release your mod for free taints modding because the option of payment exists. If you don't want to get paid for modding, you can still not get paid for modding. Nobody is stopping free modders from free modding. People that wanted to get paid before were stopped by having no official way to sell their mod due to EULAs and/or copyright laws.
Nobody has yet to explain why supposedly Skyrim is broken and that it's fine to expect people to "fix" it for free, yet a developer opening up their game and allowing people to get paid for "fixing" it is somehow abusing them. Er, wouldn't it be more of a dick move to get work on updating your game that you charge money to play done for free and keep them from getting paid at all?
"It's not a real job"
Any work you are paid for is a job.
"It's traditionally been free"
Paid mods have been a thing since PC gaming existed.
"They should work for me for free until they've bootstrapped themselves into a real job"
www.gop.com is taking applications right now