No one said anything then because there is no such $200 gold coin created in US with Obama on it. There's not even a US $200 gold coin ever created at all.
Bills larger than $100 (Since 1969, the U.S. government discontinued printing all bills larger than $100 to prevent money laundering and counterfeiting. Today, the $100 bill (featuring Benjamin Franklin) is the largest denomination in active circulation; Trump $250 bill. Maga making it way easier to launder and transport drug money. You voted for it!