Nice! I agree wot and some pow seem to be the most effective solutions (seeing captcha as one form of it?). Right now the app shows a feed based on friends of friends but I think the replies are not covered by that. But I may be wrong here and nostr:npub16zsllwrkrwt5emz2805vhjewj6nsjrw0ge0latyrn2jv5gxf5k0q5l92l7 knows better about the iOS internals.

We do have backend services yes, in fact we have now a server to calculate followers that is internally using neo4j and I think it has potential to extend the classical friend of friends Wot to a page rank based solution.

https://github.com/planetary-social/nos-followers

Pagerank could extend it to more people than the one level friend of friends. We are calculating it currently but we are not using it for the moment

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Forgot to mention, we’re also using your strfry policies, so thanks for that! We made a tweak for banning IPs based on rate-limit abuse, which worked well against certain types of spam. I can create a PR for upstream at some point. https://github.com/planetary-social/strfry-policies/blob/nos-changes/src/policies/rate-limit-policy.ts