If the SPR was not good had not been listed so long on Bittrex, SPR listed on Bittrex before Coin101 joined the SPR. If the SPR security is not good then not listed on Bittrex or have been nock out in the past 3 years. Remember Bittrex has asked a very high security of coin, to be listed. SPR still exists now. HLM still is Big question?
19/12/2014 SPR gets ADD on Bittrex, 26/10/2017 SPR is round 3 years old.
SPR was nearly delisted at least a dozen times over the last couple of years due to low volume, when I was part of the SPR team, I used my own funds to prevent it from being delisted.
Something else worth considering is that Bittrex had much lower requirements for adding a coin in 2014.