These apps provide access to physical or digital products. In the case of digital products, this refers to professionally created content (Netflix) and not content created by users (YouTube).
The word "curate" is also important. Since these apps have more control over the content made available through their portals than in strictly user-driven spaces, IARC asks some follow-up questions relating to the type of content or products offered.
Examples of consumer stores for physical products include apps like Amazon, eBay, Etsy, and Target.
Examples for commercial streaming services are Spotify, Amazon Prime Instant Video, and TV media libraries.