That's a LIE. Bitcoin didn't skyrocket in price until this year. Now things are different, i.e. MUCH more profitable. In 2016 bitcoin only TRIPLED in value, but this year it multiplied 20 TIMES in value.
In 2016 mining difficulty increased only 3 TIMES, while the price also increased 3 times. That means that a $2100 investment in a 14TH contract would give you about $25,000 profit per year. Of course back then mining rigs were much less efficient than they are now, so a 14TH contract probably cost a lot more than today.