https://www.theguardian.com/technology/2020/dec/17/twitter-to-remove-tweets-that-spread-lies-about-covid-vaccines

‘Anti-vaxxer’ misinformation to be tackled from next week, and conspiracy theories from 2021

Twitter will remove tweets that spread harmful misinformation, starting with the Covid-19 vaccine, the company has announced – and from 2021 it will begin to label tweets that push conspiracy theories.