I wouldn't consider a GitHub full of "tutorial apps" as a red flag because it's very easy to underestimate the work behind a project when looking at it from an outsider's perspective.

This is especially true for code that was voluntarily written in someone's free time. For example, each work day is made of 8 hours 5 days a week, but a "hobby day" is more like 3 hours every other weekend. So I would consider one or two features per year to be a pretty productive pace for a volunteer, free time project. Or, worst case scenario, I would just be neutral about it and ignore those projects.