Biden Admin directing Big Tech censorship efforts on COVID
It's one thing for Big Tech to decide, on their own, to "fact check" and suppress free speech on a topic. I believe that to be improper, but legally difficult to challenge. Most legal protections for free speech are based around government being the bad actor, with the infamous section 230 of the Communications Decency Act being an outlier. That section extends immunity from lawsuit to companies that decide to be "platforms" for user speech, as distinct from companies that are making editorial decisions about what to publish.
I believe that Big Tech has definitely stepped over the line into making editorial decisions, thus removing those legal protections. Cases are moving through the courts that will likely decide that.