The point being that if I was to use my real name in the above places, then a simple Google search on my name will reveal, piece by piece, my marketing strategy.
Or another likely situation: I have an email list for product x, and on this list I use my real name. I'm known as an expert in product x to them. Know they could easily look me up on Google and find out that I also write about product y.
Is that a big issue? Should I use an alias in different places? Seems unethical.