Anything that gets automated, and can also be shortcutted depending on how much of it has been cached already. That really is the beauty of Make to me - it's very easy to express what parts of a job need and need not be done, because the last run produced a state that was good enough to use again.

I once built a World of Warcraft addon downloader & manager (including patching) with Make. My friends thought I was insane. Personally, I wondered how else you'd do it :-)

(actually, looking back at it, I apparently built it on plan9's mk (https://9fans.github.io/plan9port/man/man1/mk.html), but it's close enough)