Thank you for the tips.
I'm a moderator on the community where I encountered the spambot account, and already banned it there. My question is wondering how I can report the user upstream to the instance admins. I'm not very familiar with Lemmy, I see that there's a modlog, so perhaps the SDF admins would need to monitor it and act based on the user getting banned from one of their communities?
Just learned about this, made editing speed limits a lot easier!