[Macha]

> Imagine if Amazon.co.uk was the real Amazon and Amazon.com was like

This is actually an interesting example, because Amazon.com is a US/Canada specific site, while Amazon.co.uk is the UK/Ireland site (though I'd imagine they'll eventually either set up an Amazon.ie or change the redirect to Amazon.de with the tax/import brexit implications of that). So while all domains are Amazon owned, I wouldn't say Amazon has .com primacy over regional domains.

Ditto for google search, though the rest of their products are on google.com for me (I think gmail used to be googlemail.co.uk in the UK and googlemail.de in Germany because of local companies who had the gmail name first, until Google bought out the names from the local owners).

All the web 2.0 or newer companies are .com rather than regionalised though.