The problem is you get 10% of a tiny number because most of the profit gets outsourced to other jurisdictions. This global minimum tax idea allows you to charge taxes for profits in other jurisdictions that are undertaxed so it lets you hit the numbers on the global revenue. Apple for example has a tiny fraction of profit in the US because they move their IP to a low tax jurisdiction and license it to themselves at high prices which makes their profit in the US very low because most of the profit from the phones goes into the technology licenses making it profit in the low tax jurisdiction rather than in the US.