I heard about it last year. As far as I can remember it was launched and opened for mining in September 2017. I don't remember all the details but at that time it seemed worthy mining for.
September 2017 was the peak time for cryptocurrency and mining was a very profitable source of income but in this time even bitcoin mining is not giving good profit and miners think that if the price drop little bit they will stop mining because of no profit and nobody wants to waste his time and money. In these days I didnt hear that anybody is mining whalecoin.