Yep, if any account that you don't follow has sent repeated messages to you, it will go into the anti-spam filter. This is a very typical spam we see in Nostr (random accounts messaging everyone, all the time). Once you follow them, you tell the app knows that you trust the account and thus it doesn't go to the spam filter. In that sense, it's quite similar to the Gmail Spam folder for marketing accounts. Repeat a few times and it all ends up there.

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In these cases it wasn't repeated messages. They were replies (one reply each) and then one DM, (from a normal person lol). I can only assume they had been reported for unpopular opinions by people I follow. But there was no 'reveal post' or any alert or indication in any of the scenarios I've come across. (Apart from using plebstr as a sort of amethyst plugin to reveal these posts). I'd like to think these things can be less common. I'm also not that keen on having to follow people just to see their replies lol. I wonder if there is a solution to this (?)
It's also possible that Amethyst is not finding the message on relays. Did you find the accounts in the security filter session in the left drawer? If they were never there and you never saw a red button, then it is something else (like a slow relay or a relay amethyst cannot connect to)
Yes, I will do. Well, hopefully I won't have to lol but I will if I see it. Thanks for your answers. I'm still going to start a prog/dungeonsynth band called Amethyst Shadowban, the name is too good. But you are welcome to join it;)