I think GPL was delisted, because Cryptopia not understand how each coin work.
They see low hashrate and think, it can be easy forked and have not many miners.
Recently we discuss that GPL need new chain, but it was rejected because Cryptopia not accept swap and demand relisting for full price.
Now new coin listing cost 39000 USD. (6BTC)

Soon I create new coin based on latest SCIFI codebase. Pure PoS with rebranding,
 to remove copyright problems that was with Gold Pressed Latinum name.