>>133121bots has been good enough to make bad posts for a while. Some require more human involvement than others.
A human can decide what possible sentences or keywords they want the bot to choose from and have a pool of images that it can pick from. These more primitive bots are no more advanced than a series of rand functions and if statements. While more advanced bots can have a basic "personality" or posting style. It's not intelligent, but neither are human spammers. It's just smart enough to be an asshole.
Twitter is absolutely filled with the latter kind of bots, they comprise at least 50% of the blue checkmark accounts. While Meta openly admits to using bots in place of real users. Youtubers bot their own comments to boost videos in the algorithm. Bots are becoming a problem all over the web, there's nothing "schizo" about it.