Yes, it has been proven that Costello is a serial scammer.
His first 8-K involved securities fraud when he lied about his education to CON investors into believing that he had the business acumen to manage a Billion dollar hedge fund - which we know isn't true.
We also know that Costello doesn't own a weed bank with deposits of over $500 million.
Now Costello has been sued by CANN for Breach of Contract and misappropriation of funds.
Costello is a failed Limo driver and an alcoholic who has anger management issues.
GRNF hasn't made a single acquisition - there hasn't been a reverse merger.