MWC Grand Prize Winner Replaced…
…the questionable image that violated the challenge rules

48 hours ago, I wrote “The MWC Grand Prize Winner Has a Copyright Problem”. The main issue was a missing source citation for the featured image of the overall winner. This missing attribution should have excluded the post from the challenge as the proper citation was a rule for entering the challenge.
24 hours ago, 1 day after my post, the image of this winning post has been replaced with another image and proper source attribution.
This replacement raises another important question.
Are the winners of the challenge allowed to change their entries after the challenge has ended?
I couldn’t find specific information about this in the official Medium challenge rules. What I found, though, was that Medium (and contest sponsors) are allowed to modify entries afterward.

This means Medium themselves changed the image?