I think some of these are noobs building this for themselves but forgetting to close the door. Spammers most likely will get their own instances but you can defederate the entire server easily. It gets harder when spammers mix bots with real users on one or multiple instances.
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Yeah, I think active users per time period is probably the better metric, but that is also growing nicely:
https://lemmy.fediverse.observer/dailystats&days=120
(Though with ~40k obviously much lower)
Yeah, I wish we had a list to track just the real instances.
I think some of these are noobs building this for themselves but forgetting to close the door. Spammers most likely will get their own instances but you can defederate the entire server easily. It gets harder when spammers mix bots with real users on one or multiple instances.