I will not say how much, but enough to be comfortable -thought I would no complain to have more -. But I'm far from the cap.

There were legacy who already were capped at the 2.0 launch.

Is it difficult to make gils? Yes and no. No because there are many ways, yes, because you need to spend pretty much time in the game and to be lucky with RNG. All random rare HL saleable items are interesting : minions, items for crafts, materia, gathering. FC can earn nice amount with the right items from expeditions... Extrems, Raids, Diadem or PoD highest levels can provide interesting things.

But it is a lot of grinding and farm. You do can earn 1M a day (a few succeed to do more).