But at the early stages it takes way more data gathering and processing to make the best educated guess possible especially for the emerging technologies.

Available Materials
Information from the website, socials, one-pagers or pitch decks depending on the product stage. The more detailed and transparent it is - the best.

Problem Valdation
see more in the article …

Market size
see more in the article …

Team
Transparent info, relevant experience.

Competition
None mentioned in the materials is not a good sign - either
see more in Niche Selection and Market Size?

Metrics
?

Website
Quality

Speed, mobile version, Google Page Speed
See in the article
Socials
Same as website - overall quality, consistency, regular updates etc indicate a healthy state.

Metrics - check they are fair.
Observing an anomaly possibly meaning fake subscriptions does not necessarily meant a scammy product, yet it is a minus.

Community
Hop into the chats - for Web3 those are usually a Discord and/or Telegram ones. See how everything started and how’s everything going. Drop a line there, ask something direct about the product, and see how community and team members react.
A strict redflag will be censorship if no general rules or laws were violated.