@MissingThePt
Answer:
Bandwidth --- LOTS of it
Even if it was just the text, which it is not, he is forgetting about the photos, videos, and audio recordings on Wikipedia, but assume it were just the text alone
The sheer amount of traffic Wikipedia uses in just 1 hour, let alone a day, a week, a month, or a year, is an insane amount of bandwidth
He's also forgetting Wikipedia is hosted world-wide to that it is fast and smooth loading, everywhere.
He's forgetting about the security cost