"As of 21 September 2022, the size of the current version of all articles compressed is about 21.23 GB without media."
(Note that's gzipped, so the actual size is much higher in-use.)
Media is, of course, vastly larger. Sadly, the last number given was from 2014, so I'd expect it to have increased massively since then:
"The size of the media files in Wikimedia Commons, which includes the images, videos and other media used across all the language-specific Wikipedias was described as well over 23 TB near the end of 2014"
OK; I did a quick dig to see how big Wikipedia is, but you've dug deeper.
You can still stick the whole English Wikipedia on a single disk, probably with all linked media (I suspect that a lot of what's on Wikimedia isn't linked from Wikipedia articles). So the main cost issue is serving content to the network; and there are lots of server farms that would cheerfully do that for the love.