I guess there's no server costs, it's just a script that copy pastes old content. You only need a laptop with posting keys and user names, plus that script. Within a single hour, you could likely post like 10,000 times, using just that laptop with almost zero running costs.
It could get a bit tricky if you were to take the profits out.
Ahh, I'm not too technical with things like this, didn't realise it could be done so easily that's very worrying for the potential harm it could cause in terms of just sheer spam around every community and corner of hive 🤔