Typically when you see mass automation of benign posts they are "priming" the accounts to make them appear human and trustworthy before they start spamming/phis

Typically when you see mass automation of benign posts they are "priming" the accounts to make them appear human and trustworthy before they start spamming/phishing with them later. Brand new accounts are treated with more scrutiny by spam filters so this technique lets them get around that. A more primitive version of the technique was YouTube comment bots that simply re-posted other users comments verbatim - now with LLMs they can easily generate unique white noise posts instead.