The technical articles can serve as highly effective ads to lure your potential customers. The kind of technical writing that will leave no doubt in the minds of your readers that you demonstrate deep expertise in the technologies you are an expert in.
This is generally true of writing in tech whether articles or books. You can usually make more as a side effect (or as part of a salaried position) writing than you ever will with someone paying you directly.
Here's an example https://burke.services/segment.html taken from https://burke.services/