It is my experience that a lot of people, self-taught or not, call what they do "data science", although it has nothing to do with science. In many cases what they do is put together code snippets they found on the web, try different models without understanding them, and select the results which appear most appealing to them. It bothered me enough to write an article on why data scientist is a deeply misunderstood term: https://thomas-baumgartner.medium.com/data-scientist-is-a-deeply-misunderstood-term-2d53ed97ef74