Sort:  

In my opinion, it might be because mining pool is very less profitable because the value of crypto coins continues to decline and difficult to increase so that profits are not obtained by miners.

Coin Marketplace

STEEM 0.06
TRX 0.32
JST 0.064
BTC 68305.90
ETH 2082.69
USDT 1.00
SBD 0.48