I made a little research and Bitso was founded in 2014 by Ben Peters, Daniel Vogel and Pablo Gonzalez. I've seen some interviews of Pablo and Daniel, and they tell the story of how they created Bitso. It's actually the first Crypto Exchange in Mexico.

Also, a friend of mine called @josepimpo who is also on Hive worked on Bitso, and he has done many interviews he even had a chat with the founder of SuperRare.

Long story short Bitso began with two people, little by little it gained the confidence of the people. They started gathering a team of developers and also of people that are experts on security and legal things. So they have made a great work and have help a lot of people enter this world.

I also found this two interviews (they are a little old):

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