Mining contracts typically become scams at some point.
Yes they are and i read in Mintsy forum somebody got refund for unworking contract, so i will take now everyday screenshot of 24h hashrate and i send those to Mintsy in next week hoping to get refund also.
Now i have not 24h graph at all and support just apogolyzing situation but nothing happens.

Nice to see how they keep promise to fix bug to connect workers to CleverMining
