Yeah this is a typical pump 'n' dump scheme. He buys the stock ahead of everybody, pumped up the stock over social media and then dumped it before everyone else causing the stock price crashing to the ground leaving everyone else holding the bag. It's a good thing that he's arrested. Of course it's not the same as GME. If one hasn't noticed, the GME stock price has not crashed to the floor. It's now back to where it was before after the shorters covered.
"Yamada has yet to be charged, and it’s not clear whether he will be. " I mean seriously, people following someone on the net should take responsibility for their own actions.