What are the digital agencies that take not a subscriber, but a percentage?

Question

Search Engine Optimization

Hi,
A couple of years ago I came across a peppy ad from some digital agency, the main message of which was this: we understand that you are young and you do not have money for a monthly fee, so we will promote you and take a percentage of the profits .
And now I'm in exactly the same situation. I am the target audience of this advertisement, but two years later :) Tell me, please, what kind of company is this, if someone has come across it. I wonder if their business model has worked or if they have already closed.
Google finds some boring links, and the site of this company, I remember, was hipster and fun.
Thank you!

Answer 1

So they probably closed, with this approach you won’t live long))

Answer 2

A serious agency will not work with a company that does not have money for a percentage)

Answer 3

google adwords and yandex direct. You only pay for transfers. You can start with a small budget.