What ways of monetization can recruiting services have?

Question

Programming

Interested in the question of how recruiting services earn, for example, such as: hh, rabota.mail, etc.
and possibly some others.
What possible ways of monetization they can have

Answer 1

What can be the monetization of the bulletin board?

Answer 2

Employers pay.
Then you figure out what. The easiest thing is to register on all these message boards as an employer and try.

Answer 3

For grandmas they select staff

Answer 4

The employer usually pays.