Digital assets are not physical goods and are not individually priced relative to their production cost, this is why it does not cost you 200 million dollars (or whatever the number is) to play Fortnite and for the last 20~ years every AAA game has been $60 regardless of how much it actually cost to make it.
To summarize my point as best I can:
A fee is a preventative tool
Moderation is a reactive tool
You need both. Having effective preventative tools means that the moderation team can focus their efforts on issues that are not easily prevented such as cases of stolen content and fraud, rather than being bogged down by trying to manage spam and mislabeled content. Yes, a fee is a cost. Moderation also has costs. Nothing is free. But some tools are more cost effective and scalable than others.
We could continue to go back and forth but I’ve said my piece, perhaps I don’t know what I’m talking about and others know better. I don’t know, but I don’t have anything else to add so it’s best I stop here.