scam /skam/
a dishonest scheme; a fraud.
One could argue they have schemed and were dishonest, an interpretation matters...
This case shows how gateways (CEXs) make bitshares (DEX) nonDEX exchange for most assets. DEX on paper and adverts, CEX in reality. But OL had defunct gates for some coins (even though not officially delisted) for years, but it's been tolerated by the community and still used for some other assets.