> More importantly, how could wikipedia possibly work if contributors retained copyright in any form over their submitted articles and edits?

Note, the cc-by-sa 4.0 license that wikipedia uses requires you to waive any moral rights to the extent possible. In canada if you are the creator of the work, then you can waive all of them, so its really a moot point. https://creativecommons.org/licenses/by-sa/4.0/legalcode.en

In general though, moral rights tend to be the sort of thing where they only come into play if you're being an asshole, so it mostly doesn't matter.