Uber was a good investment for all of their private investors until SoftBank. For many of those investors, it was the best investment they ever made (see Benchm

Uber was a good investment for all of their private investors until SoftBank. For many of those investors, it was the best investment they ever made (see Benchmark, for example). For very late stage private investors who entered when the company was valued around $50B, it's more complicated and depends on the entry and exit timing. But rest assured that the returns to all investors who bought their stake before 2015 greatly exceeded their opportunity cost.