Is it possible/common to make passive income while in dental school?

I always see posts about the dental school debt, choose the cheapest school, live like a student, etc and that having a part time job during school is usually not feasible. But what about passive income? For example, there are people who blog/make youtube videos and get $ from ads or sell items on Redbubble. I see a lot of dental "instagram influencers" that are also brand ambassadors for different products (not just figs), and I image people could do that with other niche topics, such as... Is it possible/common to make passive income while in dental school?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Dental Source Type: forums