I can say "you should get the vaccine!" Companies that want to say these kinds of things have rules to abide by: and thanks fully so.
I'm much for free speech, but more in the sense that we should be able to discuss policy/politics/critique/bitch/bash/religions/etc. Not so we can make terror plans, defame, harass, bully and share child porn.
Not sure what happened to your cousin... But I'm curious now. Care to share?