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That's ultimately just the Internet being the Internet.
On the fediverse, any instance shouldn't blindly trust any other instance for that exact reason. That's part of the game. Instances share the data over ActivityPub, and it's up to you to process and make use of that data. That includes spam filtering and whatnot. Some instances have CSAM detection for example.
Every instance that's subscribed to a user or community gets the full set of data: every vote, from every user, from every instance involved. We have the data, we can analyze it. And that's what really matters.
It doesn't matter if there's rogue instances trying to manipulate votes. Everyone have the data to detect and filter out the noise. Maybe one day it'll be like E-Mail where the majority of the traffic is spam. But just like E-Mail, we'll make filters and make it work. If all else fails, there's always the allowlist method: only see content from sources you trust not be spammy. You can even run AI models on it to filter the data if you want. You have the data, you can do whatever you want with it to make it useful for you.
I have faith in the protocol and its openness, not the software that runs it.
Thank you for your response. May I ask (since you seem very knowledgeable): Could a singular instance manipulate their backend votes on a single post and have it replicate in order to garner more/less interest?
Example:
I'll admit that I have not properly studied the ActivityPub implementation as described by activitypub.rocks, but we're all continuously learning.
Kind of but not really? You'd have to federate out every vote individually. There's no upvotes totals anywhere, there's a
votetable that contains who voted up/down on what, and it's counted as needed. So if you want to send out 1000 votes, you need 1000 valid users and also send 1000 different activities to at least one instance.You can make it display 100000 votes on your own instance if you want, but it's not going to alter the rating on other instances because they run their own tally.
If you really want this to work long term, you need a credible looking instance with credible looking users that are ideally actually subscribed to the target community, and credible activity patterns too. Otherwise, the community can detect what you're doing and defederate you and purge all the activities from your instance, and also revert all those votes as a side effect.
Remember, all votes are individual activities, and all votes are replicated individually to every instance. On Kbin, you can even see all the votes right from the UI, they don't even hide it! You can count them yourself if you want. So anyone with the dataset can analyze it and sound the alarm. And each instance can potentially have its own algorithm for that, so instead of having just one target to game, like Reddit and a subreddit, you have hundreds of instances to fool. There's so many signals I could use to fight spam: instance age, instance user growth, the frequency and timing of the votes, are the users seemingly active 24/7, what other communities those users post into, what are they voting for, do they all vote in agreement with each other, and on and on.
So, you technically can manipulate votes but it takes a lot of effort and care to make it as hard as possible to detect in practice. We play the same cat and mouse game as Reddit, but distributed and with many more eyes on it.