Steve Kirsch is AFAIK not a rationalist, but he was banned from Medium for claiming the effectiveness of a specific drug in treating Covid-19 was 100% based on two trials. Personally I think his claim is overstated (confidence intervals and so on) but the main thrust of his argument is reasonable and definitely not even close to ban worthy. https://www.skirsch.io/medium-ban-for-life/
Do we have examples of people rationalists community who posted about COVID-19 and who were banned on websites for taking a stance that goes against mainstream authorities?