Obviously it was registered at some point - it had to be to become listed on an exchange.
The shell MNZO was reversed merged into was "Fortune Oil Company". That scam came into existence around 2005. It was a registered stock, until 2010, at which point it filed a Form 15-12G, which effectively de-registered the stock, relieving it of the requirement to file Form 10s.
MNZO then reverse merged into a "clean shell". At no point was the MNZO stock registered. Neither is there a requirement that a Microcrap stock trading on the OTC be registered. A non-registered OTC stock is a Pink Sheet stock.
Thus, MNZO did the usual for a Pinky - pay the OTC Market Group a yearly fee to post Bogus financials
Where there is no requirement they be audited. Neither does the SEC review them as they come out - stock isn't registered.
And since it was never revoked it's still an active ticker and freely trading if anyone wants to buy or sell it.
Again, it can't be revoked by the SEC as it never was registered. And yes, FINRA will leave it alone as long as it continues to trade. It needs zero trades for about 2 yrs for FINRA to take out the ticker. Until then, the ticker survives, and can be traded.
Again, your examples of an ORYN were registered with the SEC. With the SEC revoking them when they became delinquent in their filings. A lot of these scams get into the situation which filing is the equivalent of a self hanging in front of the SEC. So instead, they take the money and run. Go delinquent. In Kenny's Manzio's case he was run out of the market by the SEC, due to his involvement in another scam.