Technically speaking? Sure, most of the companies I've worked at aren't exactly doing rocket science. Creating media websites and doing work for clients as a marketing company are things that have a very low barrier to entry.

The challenge is that in most of these cases, success is based on trust and long-term reputation building rather than pure technical skill. And doing a good job in either industry requires a lot more time, resources and effort than a single person may be able to provide.

So, while I could definitely spin up some very similar sites, creating the actual content at a level of quality that people would even bother to read would be a chore, as would finding an audience in general.