Answer:
This is very simple, they should start billing their clients right away.
You don't have to bill your clients for the full legal expenses, but they for sure need to start making some money.
It is very normal that new businesses don't get enough revenue to cover their operation expenses right away. Even for big corporations, like Amazon and FB, it may take years to reach the break even point.
When you open a business you have to keep some money as reserve to cover some expenses for at least a few months.