

Software updates can be deployed regionally either based on carrier or by product SKU. If there are different SKUs for North American vs EU phones, which is almost universally the case because of differing regional requirements such as radio technology, target price points and so on. That means that phone model ‘X (NA)’ could have a different update schedule than ‘X (EU)’.
Why? money, of course. There is a small cost to supporting a SKU for updates, even if it’s the same software that’s already being deployed to another SKU. That increases if the two SKUs have different processors (Samsung does this). On top of that, longer update schedules means people aren’t replacing their phones as often, which means theoretically less sales - though I find that claim dubious as many people replace their phones long before they lose software support.
So yes, while it’s possible that a company might honour a 7 year update schedule outside of EU, it would be by their choice to do so.
Even with the lithium mining, an EV will reach “pollution parity” with a comparable sized ICE vehicle anywhere from 6 months to 5 years on the road, largely depending on what is powering the electrical grid (coal fired electricity being the 5 year), with the average being 1-2 years. That means that an EV from 2023 on average has caused less total pollution than an ICE vehicle of the same age.
On top of that, there has been significant progress made in recycling these batteries so that less lithium needs to be mined, as well as using other metals such as sodium, both sodium ion and sodium iron batteries are commercially available.