Exchanges (NYSE or NASDAQ) each set their own standards for listing and continuing to trade a security.
A security may be delisted if it does not meet the requirements of its particular exchange.
Delisted securities will trade Over The Counter (OTC).
Since Robinhood does not currently support OTC trading, when securities that you own on Robinhood are delisted they will be set to liquidating only.
Claims presented against KYHC will be reviewed by the Liquidator in accordance with KRS 304.33.