Good, it is a start. And much better would be for those EU politicians, journalists and other people to move to Mastodon, Pixelfed, and similar independent platforms. That would make a much better example.
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False premise, most people are not on Twitter. Outside of Japan and the US, comparatively few people use Twitter.
Yet, all the politicians (both government and non-government), media personalities, and many state run institutions actively run Twitter accounts. So it is one of the primary ways to understand what they are saying.