Not necessarily cash, but definitely a bit of luck. Some lawyers, if they think a case is guaranteed to go your way, will do the work for free in exchange for receiving a portion of the damages the final judgement will award you. Even rarer, some lawyers care enough about some issues on a personal level that they’ll work for free, or reduced rates, on certain cases.
In this case, I’m not sure there are any damages whatsoever to award to OP - a “win” is forcing the company to abide by the GPL, not pay up money. The EFF and the FSF, as others have brought up, are probably the best bet to find lawyers that would work on this case for the outcome instead of the pay.
An important part of that process that needs mentioning is that when the mothers are convinced by Nestle to feed their babies formula instead of their breast milk, their bodies will stop producing the milk before the baby is weaned from it.
So Nestle literally endangers babies’ lives just to sell more baby formula.