Take the number advertised on the Forbes list and their self reported number. Tax then according to which is the higher.

Tax unrealised gains on holdings annually not on realisation. Tax banks for giving loans against stock holdings, with rate of interest under 2%.

These laws are made by corporation like FB who wish to shift the blame away from itself for their transgressions. Australian and EU laws are banning social media for pre teens and kids. So instead of them developing ways to follow that law they are shifting that onus on to the operating system.

A promise of it not the actual router.