They have seemingly infinite cash because interest rates in Japan are zero or negative. Plus, sovereign arab funds with oil money are so large that they need to invest in everything.
"The overall group has ¥15.7tn ($143bn) of interest-bearing debt and ¥27tn of total liabilities, far greater than its ¥11.6tn market cap."
Softbank has $150 billion of debt, and its liabilities is more than its market cap.
This is a company (Softbank) which is over flowing with debt, funding a company that burns money to grow (Uber) and does an IPO to offload all that to retail investors.
And we think that's something to envy?
So, envying billions created in this manner is really envying not being a (massively indirect) villain.
Remember: not all $$$ are created equal. Think about the history of the $ before envying it.