How do you feel about the direction "Outsourcing of an online store"?

Question

Outsourcing

1. What do you know about this direction?
2. Have you/friends used this service?
3. Are you planning?
4. Can you recommend any company?

Answer 1

If you mean warehouse, order processing, etc.
I read a large study about this, it all came down to the fact that for start-up stores it is very expensive, or there should be a huge margin.

Answer 2

I don't understand because the term is very vague.
What services do you mean by this?