How does banning an individual from printing books restrict free speech? Do you think free speech didn't exist before the printing press?
The proper analogy would be banning books with certain content, which we already do. You can't distribute a book calling for a specific person to be killed or doxxing them. Doing this on social media in Ethiopia is encouraged, as it drives engagement and has lead to actual deaths of people I know. They have a policy not to moderate this content despite having the resources. Just like they have a policy to make the apps as addictive as possible.
More importantly, Facebook is not a "printed book", it is the printing press. It owns the internet. It's not remotely comparable. And that's why it is a threat to free speech
It would be as if printing presses were so complicated and expensive that the barrier to entry was so high as to price out everyone but a few select publishers. I wouldn't try to over-extend that metaphor though.