I remember a few games which didn’t require such sacrifices from developers.
Some even commercial. Like NWN, with people making their own campaigns without, you know, any effort spent by the developers of the game itself.
Of course when the business model is milking players and making it problematic (either technically or by paradigm) to satisfy interest with community-made modifications, then all the load is on the devs or else the game becomes irrelevant. Well, guess whose fault that is.
Which is why some degree of chaotic lawlessness (as in pirate disks being sold near subway entrances) is good for humanity and good for the market.
And there’s no inherent moral value in intellectual property or copyright, so only whether it’s ultimately better or worse to have it is important.