Ask HN: What are the typical user:employee ratios at various tech startups?

I'm doing some research about the relationship between labor needs and user base across different types of startups.

For example, how many employees did startups like AirBnb and Uber have as their user base expanded? How many were engineers and how many were customer service people? How many exployees do B2C startups require as their customer bases grow?

If anyone can help point me to where I could find this sort of information, I'd really appreciate it