Are all of these altcoins mostly used in chinnese community or it is just bitshares? So is it the site bittrex that had some issues or those listed Altcoins have violated some SEC rules. I am not familiar with the other altcoins but are they banned to to other exchange sites or it's just bittrex violated rules of those altcoin?
Listed altcoins violating SEC security laws. SEC wants to protect US token investors. If they are being sold a security, it requires proper risk disclosures that they need to vet, and so requires SEC registration if its a security (selling "expectation of profit based on the efforts of others") token. Most security tokens are not registered with SEC and if selling to US investors can be charged with selling an unregistered security. SEC will be investigating them if unregistered and delisting them from US exchanges.