> As far as I know, in most countries, acquiring permanent residence requires living in the country for years first and then applying, so you will be on time-limited visas until then.

I joined a US-based Company who organized my Green Card without me having ever been there.

As long as your intention is to migrate to a different country you're regarded as a non-resident in which case you wont have to pay taxes on worldwide income, unlike in the US.