[Idea Validation] Digital goods selling platforms aggregator search engine

Hello dear members of BHW,

Just recently I have started using one of digital goods selling platforms out there in the market. You know - creating account,
then creating shops and adding virtual products. Then I just checked whether these product links are being indexed by Google and saw that they are not.
So I made a conclusion that those digital products are being promoted on various social media channels, messaging platforms, forums, etc...

The key idea is that every digital product listing could provide valuable source of information for IM marketers regarding niche that is in demand right now,
especially when combined with number of feedbacks. So marketer could gather list of potential niches and use them later on while researching: checking the competition or smth.

So the idea would sound like specificed search engine for those digital goods selling platforms:

• You type in the keyword in search bar and get list of matching products
• Rich sorting, filtering capabilities (for instance sorting by number of feedbacks)
• Each product listing description would be analyzed by NLP topic detection algorithm to assign extracted topic or list of topic keywords
• New product listings section with newly discovered products (hot, trendy niches)

I did a little research and found one working example close to this idea (Disclaimer - by no means I am affiliated with them in any ways nor I try to promote their servies here),
but it seems that they input those product listings by hand or let general public (shop owners) enter them themselves.
I would do that completely differently - I could use general web crawling to extract those product links and aggregate them.

What do you think of this idea:

1. Do you think it has some market demand? Would marketers use it?
2. Do you think it is possible to monetize such specificed search engine?
3. Would it be legal in terms of law?

Personally I really feel that this system could be valuable in two ways:

1. Searching for specific cheapest digital product in the market
2. Analyzing niche ideas - bots, programs, accounts selling services, etc... (for IM'ers)

I would really appreciate your honest opinion if this would be worth the time and effort spent or the possible returns are relatively small?

P.S. I am not sure if it is allowed to enter URL's of those platforms or the close existing website I've discovered so I have omitted them.

Nice information. I find interest on it. Actually, I'm also looking for products. last week, I read a lot about CJ and Fulfillman. Are they reliable?

Digital products are getting indexed fine with Shopify and I just double-checked this - The problem is within the platform you are using.