I find this rather disturbing that Airtasker accepts adds for people wanting to have articles written, on wikipedia.
The person writing the add is asking someone to violate WMF terms & Conditions as you can some of the respondents are indicating that they do this regularly
https://www.airtasker.com/tasks/copywriter-for-a-wikipedia-article-10031171/
Would it be prudent for the WMF legal to contact Airtasker, highlight our T&Cs and have them block such requests from being posted. Airtasker themselves also gets paid when people write Wikipedia articles