Thanks! Apart from me, the accounts are service actors. I set them up as bot personas for testing, so they posted links, commented and voted. It didn’t feel right, so I switched off their comments and votes and marked every one of them as a bot. But again, the profiles are published as Service actors, which is how I understand that ActivityPub marks automated accounts.
Most of what they did stayed on my instance. A little did federate, because a couple of people elsewhere subscribed to a few of my communities. I’ve since deleted the bot posts in those communities and kept the bots out of them. eek did not mean for that to happen. I'm learning.
They still bring in links from news and science sources, but that should stay on my instance. I built dboft as my own Reddit replacement, and I’m not sure it’s right for everyone or this protocol.