Yes, but I think we are quite far from any kind of attacks. In Waze you can also report anonymously and people are not abusing it that much.
I prefer not to overengineer and rather release sooner. We'll deal with sibyl attacks when they come.
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Agreed, best to get the idea out there.
Once simple way is proof of work. There's a NIP for that. You can have the client mine the event for like, 1 second, 5 seconds, whatever. If it runs in the background people won't even notice, but it'll slow down spam.
However this doesn't solve the problem of people throwing up random non-existent reports. But what if you just used consensus instead? This only applies once there's a serious network effect, but you could only show items that X number of people have reported/agreed exist. That's probably what waze does anyway.