Sorry for the late reply. Seen some issues with lnbits, sometimes the API doesn't return a preimage for the paid invoice. Maybe try with another alby backend, like coinos?
Is it something like enabling a way to censor out spam? Like maybe I can configure a setting so that my nostr client only shows me messages which have a (PoW) proof of at least difficulty N performed? Or ?????
Exactly, its a way to keep out spam from anything that builds on top of Nostr.
That can be the a setting in the chat client to restrict replies, private DMs, etc. Other apps that rely on messaging can use PoW to keep out spam too, like blog comments ( https://damus.io/log/2022-08-02-introducing-damus-log.html ), forums, captchas etc.
Facebook (hah) commnunities where you want to welcome people, but the group admins have no time or interest to deal with bots.
Basically anywhere there is spam, a simple PoW setting (only show above difficulty X) can be effective.
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