There are instances with over 9k accounts and like 5 posts. There's a lot of bots.

Hope the staff works to solve this.

The problem is that there is no "the staff" as such. The developers can add tools, but if people want bot instances, there will be bot instances. The instance administrators can just not federate with them (which makes the most sense to me) but that will be on an instance by instance basis.

I understand, thank you. Then of that way how possible avoid that Lemmy.world for example would filled with bots.

Well Lemmy.worlsld can defederate with the bit instances. That won't affect any other instance though.

As far as bots making accounts on Lemmy.world, they've added a captcha which helps a lot.

I hope we'll get some improved moderating tools that help eventually as well.