Every company out there is trying to make more money. If employing people doesn't correlate, and the trends between the two (making money and employing people) are diverging, then companies will make more money and employ less people.
It happens for many reasons - the solvable, as is the case with market capture monopolies, particularly for services (there exist patent troll businesses who employ no one, make no products, but sue with acquired IP rights to make large amounts of profit) and the "unfixable" as is the case with automation and technological efficiency.
The last 30 years have largely been defined by American businesses moving operations towards profit without labor - the per-employee revenues of some of the largest corporations are ludicrous compared to what could be found back then. That trend is unlikely to reverse and very likely to go exponential.