Gridcoin is driven by only one buggy developer. It seems not to be truly decentralized cryptocurrency now.

Several of buggy releases and several of blockchain snapshots are published in last few weeks.

Developer is just asking people to remove his coin on Poloniex just because they do not compile his new released code fast enough. (He did not even care about security reviews of his code).

Developer is also trying to move some coin from foundation wallet to his friend.

I do not think Gridcoin is secure currency to invest now.