It's tax avoidance and balance sheet optimisation. No short term debt on the balance sheet, meaning you can borrow more long term debt. Access to debt is important to these multinational companies, because they generally only grow through large M&A deals. They're rolling companies up into one behemoth. The higher rated the debt is, the cheaper (and more) they can borrow.
A lot of developed countries are also introducing caps on interest deductions (e.g. at most 30% of EBITDA per tax year). Since you're paying more to your supplier, which tends to be an at arms length market rate transaction, the entire acquisition cost can just be tax deducted and thus falls outside of the application of said laws.