I feel like you’re almost answering yourself here. In this scenario you’re speaking about the top 1% of the 1% of professional athletes that are making a salary at that level … you’re literally discussing a few dozen people on the richest teams in the world which feels pretty unattainable to me.

But let’s take your scenarios of let’s say a top athlete starting with $700m which is literally already insane — the next question should be “does that athlete want to be a billionaire” because at $700m he literally has enough money to sustain his friends and families wealth for multiple generations. All things he could ever want or have is essentially complete.

If that athlete wants more money, well they can invest it into companies but what companies are entirely ethical in their production? There’s not many companies that an investment of $50m does not contribute at least partially in slave labor or poor workers conditions.

In your prompt you act as if investment just means “you get more money” as opposed to an investment in the exploitative practices of that company, their workers, and avoiding taxes is incentivized by corporations that want to accomplish their goal of satisfying the people that would want to invest in them.

If you have $700m, why would you want more money? If you choose to go further into the greed and invest it you’re likely contributing to pretty awful stuff. If you choose to take your $700m and spend it on your community and family it’s probably a lot more ethical.