In theory - sure. In practice - all countries in the world have to agree to raise taxes, even though individually they are better off betraying this agreement and lowering them, thereby attracting the rich and ending up with more, not less, money.
And if all countries agree to tax the rich the way they should, we might as well go and build socialism everywhere, because not having everyone onboard is a main issue there too.
If I understood it correctly, in this context it means that the icons normally retain the original logo and color scheme, while incorporating them into a single style.