A question about shoutout

Generally i see people tell to drive traffic to the fake account where people will then click… Unless you eant to grow the account why when the unique goal is sells do promotion of another account doing just a shoutout (swipeup+linkinbio+caption CTA that direct people to bio) isnt this enough ??

Even when you want to just promote with slave why not just do directly shoutout-mainaccount

Why people do shoutout-slave account(with fake pannels)—mainaccount ???