Outside of the fake likes and followers, there are also people that sell “real” ones too. Once again, if you buy this type of engagement… You are buying a lie. Plain and simple.
The platforms that market these are either never going to deliver anything, at all… Or they are going to take your money and post your link in a massive engagement group (that’s unregulated or managed) over, and over, and over – using hundreds of aliases they automated, driving illegitimate traffic to fill the order. You will be lucky if you get 75% of what you paid for and in the long run it will be detrimental to your Instagram account.