Among other economic effects, VATs do not incentivize vertical integration. With a traditional sales tax, corporations can avoid paying the tax by bringing all the suppliers in-house so that there's no transaction to tax. With a VAT, it's all the same: either you pay the tax or you pay the supplier and the supplier pays the tax.
This is precisely to prevent your easily spotted mistake of promoting vertically integrated companies.
Ehhh, I guess it is neutral if your expenses are the same as your revenue. That is no profit.
VAT is calculcated on 'the value you add'. What you owe is that amount minus the VAT paid on your expenses.
In your Apple example, the consumer pays the $1000 plus the 5% VAT to Apple, and Apple sends the 5% VAT to the IRS. If Apple bought components for that phone that included VAT, the supplier providing the components sends that VAT to the IRS, and Apple can claim that VAT from the IRS.
Apple pays 5% on the value it added, not on its profits on the phone.
If they buy $500 in components from upstream suppliers and sell the phone for $1000, they’ve added $500 of value (on which they’ll remit VAT), but not achieved $500 of profits on that phone. (They have labor and other overhead.)