I think the indication that such transactions would attract investigation by the regulators is an indication it's not all legal, but unless it's exposed nothing will be done about it.
Frankly things are far looser on the OTC than the major exchanges, and the SEC allows it to be, even more so on the Pinks.
If I were a short right now, I'd be bailing out of my position as quickly as I could without dramatically driving the price up. I know that attempting to learn what regulators are doing is common, but no telling if those with a major short position have any real indication of what the UK regulators are doing, or when they intend to announce it. Companies routinely don't provide information to investors using the excuse that they don't want to give the competition the information, meanwhile competitors have spies working within the trial and know exactly what the companies are trying to say is private.
If we truly have a massive short position, and gain approval, the short squeeze should be a thing of beauty. It needn't be 2 billion shares, if it's tens to hundreds of millions it still should generate huge margin calls and result in much higher peak prices, if there was ever a time to trade, this should be it.
Gary
Bullish