https://www.theguardian.com/technology/2019/oct/31/twitter-use-facebook-scale-against-it-ban-political-advertising

Jack Dorsey has cut off a tiny revenue stream while focusing attention on rival’s inaction

Twitter’s announcement that it will ban all political advertising has prompted a wave of calls for Facebook to do the same. But Twitter’s political advertising operation had just 21 advertisers across the entirety of the EU during the parliamentary elections this year, according to the site’s transparency report.