Today's seller of 1MM shares at $.0001 is obviously someone who doesn't believe PIPI stock will have any significant value or liquidity going forward and decided to write it off.
That holding had a market value of $40,000 the day before the SEC suspension so this does not appear to be some unsophisticated penny stock newbie. The transaction may even have been a worthless securities write-off, which would show up as a trade at $.0001. You see a lot of such transactions on no-bid stocks this time of year.
Grey market stocks are extremely illiquid. It would be very hard to sell 1MM shares of PIPI.
Many or most of the trades since the suspension may have been matched trades intended to inflate the value of the stock with the hope that shareholders would buy into the private placement being offered by Ken Ash and Georgos Androutsopolous. Hopefully no one has fallen for that scam.
Eventually all PIPI shareholders will realize that it has no real value, although that may take years as hope seems to spring eternal in penny stock land.