A lot of troll accounts are semi-automated. They run a script that detects certain keywords, and posts premade replies to them (nowadays said premade replies are being finetuned with generative AI to look less uniform), also a human is watching over them to ensure both correct operation and to overtake in case of emergency.
Source: My father’s ex-girlfriend’s ex-boyfriend was (is) a paid online troll for Fidesz. They also had Discord (later Matrix if I recall) servers for organizing mass reports, downvotes, angry/haha react campaigns, often they also did some “private doxxing”.