riftgreen, I think, it's inappropriate to compare such a large business as Starbacks or Nike for e.g.(where hundreeds of people are trying to find a job and it makes sense to create an extra account to hire) with dropshipping business.
We don't really know, if they are using a multi-site, so each link is considered to be like a different link, not of the same site.
Besides, if you analyze the links in Instagram BIO of Nike accounts, you will see, that they are different:
-
nike.com/Alphafly
- or
go.nike.com/football, which lead not right to the main website, but to it's subdomain
- and
go.nike.com/YCSU
Did you find such important information in that nice guide?
Did you think that the bluetick also can give some advantages to it's owner? It may influence too.
Anyway the author of that guide is right that the content posted in different accounts shouldn't be the same.
Otherwise, it make no sense.
We do know that Instagram blocks for using the same links in BIO, but anyone can take the risk and try to check on its own)