The problem isn't a billionaire that's done anything good, the problem is a billionaire who has done more good things than bad.
Those don't exist.
There's no amount of good you can do to make up for the amount of exploitation you had to do in order to get to be a billionaire.
It doesn't mean that a billionaire can't do anything good. It just means the world would still be better off without them.
You are right to consider the age gap, I would say the best bet for you to mitigate your concerns is to not put any sort of commitment in place until she's old enough that you're not concerned about the age gap anymore.
At 19 years old, you're not even old enough to drink if you're interested the US. I would probably say give her until 22 before you do anything that's going to evolve any sort of commitment or possible long-term consequence for either of you. In the meantime, there's nothing wrong with some low commitment dating.
I thought that during commercial breaks the characters in the show I was watching were still doing things and I was missing it because the commercials were not pausing the show in the background but playing over top of it.
What if you take a shit, turn around, and find 2 billion dollars in the toilet?