They have contacted several exchanges including Bittrex long time ago. All this delay in listing on more exchanges is due to their own inefficiencies because we know these days exchanges are overloaded with requests and running markets. I still think before the release of major updates PPT will succeed to be on more bigger liquidated exchanges to see its real value.
So this is clear for us that the problem why this coin not hit in big exchange because exchangee are overloaded. So we must be patient, i think if the progress of this project really good i believe big exchange will consider to accepted PPT coin
It also has to do with the fact that most of the major exchanges require code to be public. Populous had an issue early on with a competitor copying some of their work, so they made their code private until after Beta launches. There won't be any progress on exchanges until at least that time.
This is true, Populous's whitepaper was plagiarised by compettition. This led them to deciding to keep there code private. Meaning they do not meet the requirement set by a lot of exchanges. Once platfrom is live they will open source their code on github and will then be able to list on larger volume exchanges.