Obligatory response that this is highly dependent upon the field and your experience. Of the four authors I contacted for copies to their paper in my tenure as a child protection caseworker, none of them even replied to me let alone gave me a copy of their paper. I don’t know if it was because of the fields (psychology and social science) or because I emailed them from my .gov.au email but this advice doesn’t always hold true.

Very true. I've benefited from doing that countless times, and I keep final drafts of all of my work in folders organized by publisher title explicitly so that I can pass it forward if anybody ever emails me looking for something ive written that is now behind a paywall

(I deleted my last comment because it ended up more vitriolic than I want on the internet forever, but for anybody reading this afterwards the gist of my deleted comment earlier in the thread was "I do not respect academic publishers")