Second, companies in this increasingly autocratic and hostile US control every major digital platform that Europeans use to debate and share news, with the exception of TikTok, which is Chinese. Even Europe’s news organisations rely on Google and other US advertising technology companies for online revenue. Trump can humiliate or cripple the oligarchs who control these companies.
It’s probably the same for politicians. They are looking for widest reach. It’s not only about posting. To be effective, they need to moderate and engage with comments, which is harder to automate. Also, they might just not know about fediverse platforms (lack of marketing). In that case the solution would be to promote fediverse among users, European business, organizations and politicians.