In most major league sports in the US, there is some form of salary cap, but it really only applies to players. Organizations can spend money on other things as they wish. That applies to coaching, front office, facilities, etc.
In motorsport and in Formula 1 not so much. If a team has a dominant car, let's say half a second faster than the second best, the championship is an internal matter between its drivers. Any second tier driver sitting in one of those two cars can be world champion. The only opponent is the team mate. So most of the money goes into the car.
The Formula 1 cost cap applies to all expenses with few exceptions. Most notably drivers and the (3?) highest paid employees. Of course you must keep the bosses happy, right? Drivers could become subject to the cap in one of the next years. They won't be happy but what can they do? Furthermore teams will always find somebody to drive their cars even at one tenth of what they are paying now.