Regarding what a project should do or not it’s up to you to tell it. From your S2 entry post:
DigitalMart is a decentralised marketplace which will provide users the ability to make purchases of whatever products of their needs, and also provide merchants a marketplace to market/sale their products, it will be like the traditional Amazon, Alibaba etc, but here it will be decentralised were users will be able to utilise the crypto right in their wallet without having to convert to fiat or any local medium of exchange.
The ADMINS have clarified in TRON Grand Hackathon Season 3 - Get started Now! - #49 by cduncan that S2 projects need to be finished, to be eligible for S3.
We will be reaching out to S2 winners to check their progress. A number of them are ready to move to mainnet as far as we know.
Also, all of the S2 participants will have to deploy their projects live for the community to use otherwise they won’t be able to participate this season with any other projects.
So my question remain: can I buy something on Digitalmart? If not, that’s probably the reason for Digemart not being listed.