I mean he just tweets about bitcoin so often. He may be thinking that he is guiding his followers out of bitcoin but what he could be doing is making them more curious that they will eventually buy like his son did. Bad publicity is still publicity eh? - https://twitter.com/PeterSchiff/status/1333441586282328067
So who will be the next company that he'll attack? Visa? Paypal?
Bitcoin cannot be manipulated by one person i think because it is large system that it will be needes many experts to control it not by one person called peter. Bitcoin is a currency and the currency controlled by government or digital ecosystem.