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> Anything else requires a constant uphill battle of content filtering and deletion. You could call it censorship, but it's a necessary reality.

Depends on how you structure it. If they're paying to list, then it makes things a lot easier.

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I suspect that this is one reason you're seeing virtual conferences that are charging $50 or whatever. Yeah, it's a few dollars to offset costs. But it also keeps out the "riff-raff" so to speak.

Charging nominal fees are going to keep out the most casual users but I'm not sure it's a bad idea.

You can refund people who don't abuse your system too, either directly or in kind. That helps to keep things less about financial worth of users and more about behaviours.

True. I've also seen in-person volunteer events that charge some nominal amount that you can either get refunded or choose to donate if you show up. Even if it's only $10, there's a fairly large sunk cost effect that causes a lot more registered people to attend than if they only had to sign up for free. It can be a lot easier to plan that way.

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