SBF, the name of the visible head, is as good a collective label for the network of individual criminals and the many dozens of companies they used in their crimes as FTX, just one of the companies, is.
Except FTX is already a collective label, SBF is not.
Using SBF as a collective is a confusing and incorrect. If you want to use it as part of a collective label, you could use "SBF & co.", "SBF et al" or similar conventions for creating a collective label from a singular one.
SBF, the name of the visible head, is as good a collective label for the network of individual criminals and the many dozens of companies they used in their crimes as FTX, just one of the companies, is.