How to collect information for an Internet project of finding establishments?

Question

data mining

Hello,
Recently I was interested in such a project zoon.ru
Who thinks what? How can you collect so many establishments from cafes to car washes even in 2 years and categorize and divide them into headings in different sections?
What do you think - need 1000 people? Or is it some sort of yell.ru grabber, for example? If so, then there is a high probability of errors in the categorization of establishments and generally gross errors.
Who is familiar with the process of creating such projects?

Answer 1

This is a 100% parser, but a team of editors will still be needed ))

Answer 2

You just need to sparse the necessary establishments from directory sites and upload them to your site.
And on the site, install a search form with the criteria you need.