I think people who want to push a certain narrative might just set up a quick bot and tell that bot to start posting on Reddit or whatever and just let it run. Why not? Little effort on their part and they might actually have influence. The same reason why spammers apparently think sending me 10 text messages per day about a loan I've been approved for. It probably does work 0.0001% of the time, but that's okay if it's all automated.