I feel like this can, and should, be handled client-side. It would be a relatively simple matter of auto-hiding a post where the title is a duplicate match to anything in the last, say, 25 posts. User configurable.

I know that feels like a hack, but for the reasons posted by the top commenters, we don’t want to make things weird for parallel communities.

I moved instances recently and have been too lazy to migrate by subscriptions, so I’ve just been browsing on All with Top 6-Hour sort.

The number of bot accounts that just spam post from RSS feeds every 15-30 minutes or so and get zero engagement are infuriating. No one interacts with it! Just give it up!

“There is also a discussion over on Hacker News” well tell hacker news that the news we want to discuss is how to mitigate spam from shitty bots!

Soapbox opinion time. Post spamming to parallel communities across instances is antithetical to federation.

Post spamming discourages users from federating with parallel communities on federated instances because users who do end up with feeds congested with duplicate posts. This encourages unsubscribing which results in reduced engagement across communities and isn’t fair to other contributors who choose not to post spam. The alternative would be to block the post spammer, which wouldn’t be ideal either, since articles are often still worth reading.

If a post spammer is concerned about visibility from defederated instances, then I suggest using an instance that federates to more instances. Furthermore, please respect an instance’s choice to defederate from yours if that’s where you choose to be. If your instance was defederated from another, that means the users there do not want to see any posts from your instance, even if you think they do.

I implore post spammers to reconsider the logic behind their actions, as the impact on the fediverse is more negative than positive.

The default UI on web browsers has a fix for this already

Most have rightfully pointed out that you should block that user.

Another solution is joining more communities so it’s not your ENTIRE FEED.