We have graduates at Big 4 Tech (Google, Microsoft etc.) and other competitive tech focused companies. I'm not sure about Investment Bankers but we teach software engineering primarily so I wouldn't expect many graduates go into I Banking or Consulting.
Can you confirm you have Big 4 tech graduates who were hired fresh from getting their Udacity degree without prior experience?
For example since I attended a mediocre state school these companies did not come to interview at my school, and never granted interviews to those who directly applied.
A few years later I ended up getting hired by these same companies based on the merit of my actual experience.
However you see the big difference here? I couldn't fairly say that the big 4 hire from mediocre state schools (or from Udacity), just because someone ended up getting a job there later.
We do indeed have people who got jobs fresh out of graduating from our program. Obviously it's hard for me to discount all their prior experience and say it was entirely up to us. What I can confirm is that within months of graduating from our program they were able to get these jobs. You can read about some of these students here: https://www.udacity.com/success
Speaking of the prestige issue that WhitneyLand brought up, it seems that both of the featured engineers who are working at a "Big 4" software company attended top schools. One seems to have gone to Harvard and the other attended Rice University.
I'd be willing to bet money on the fact that anyone who got a job at a top consulting firm or an investment banking job at a bulge bracket bank was not hired primarily as a result of a Udacity degree. Hiring pipelines and signaling are a big reason why a degree from a top school is worthwhile and why top schools are not threatened by MOOCs.
(in a situation where experience alone wouldn't have earned the position)