they are excluded because the term is descriptive, these countries are excluded by the west from many agreements and organizations, they are exploited by the west and its systems of imperialism. Culturally speaking they are similar but geopolitically speaking they have nothing in common.

excluding Spanish and Portuguese colonies but including the Spanish and Portuguese people themselves i guess i should have said Spain and Portugal instead of referring to their people.

the west is not really a geographic term, and its not really well defined either it has 3 main uses:

most commonly: the west: as in western europe and their settlers colonial offshoots (excluding Spanish and Portuguese ones but including the Spanish and Portuguese themselves)

most uselessly and confusing: the west: as in the global north (also not geographic) in its entirety

and less commonly: the west: as in all european cultures or cultures derived from europe, so most of europe and all settler colonies