"..you put out some content and the company fires you"
It probably depends on the company and the type of content. I can't see coding tutorials and day-in-the-life type videos causing any problem.
Real example: TechLead is the popular YouTube channel (1m+ subscribers) of an ex-Facebook/ex-Google engineer. His videos skirt the line between parody/satire/hubris (pick your mix).
I got fired from Facebook (for having a YouTube channel) 2019: