“Many large multinationals use cost-sharing because it reflects the global nature of their business.” A comparable example might be Apple, where sales of my (american) app being sold from (american) servers somehow curiously involves the Republic of Ireland and their low corporate tax rates…
Apple pays the majority of taxes to US. They report US income and pay taxes for that to US. Ireland is involved only so far as EU income. So if your American app is sold to European users, the income is recognized as EU, and reported to Ireland. https://fortune.com/2017/10/31/trump-tax-reform-apple-multin... There are other possible criticisms on corporate tax and Apple, but this isn't a valid one.
The only way it can be claimed to be invalid is by conflating legal with moral.