The ad ones are easy to spot and filter, but there are the other bots that are much more subtle.
I know not their workings, but they register an account, choose a thread, gather the general topic of the thread, then produce some text that is vaguely in relation to the topic in an attempt to look like part of the conversation. All of that happens within a few minute time span. Right now they’re possible to spot and report, but in a few years?