Where did you find Pumo group?
I found them various places, but the majority probably come form ads in pump groups I already joined.
Is it automatically process?
I manually flag the pump post. Once the coin is determined, the stats collection is automated.
Who decides is the channel is a scam or not?
Right now, it is just a collection of data. I will provide summary data soon, but its not too difficult to find the biggest scams - just look for large "pre-pumps." That means the organizers either bought a lot of coin themselves or sold early access (or both). I'll be publishing more details on what to look for in pumps within the next couple days.
If you have any questions, please feel free to ask.