There is always a need for business research, especially in sales or investing. The question is can you make a better product than existing competitors such as Crunchbase, CB Insights, Pitchbook, etc. and give it a a viable business model? Mattermark couldn't.
Mattermark always seemed ironically named to me. I would never see anything that mattered there so I learned to ignore it.
I think of back in the day when people started to complain that TechCrunch was only about Facebook and Apple and it was almost impossible to get a real startup mentioned there. Well 95% of the companies that want to get in TechCrunch and don't have the same trendy names and trendy addresses as Mattermark companies but mostly people don't care.
There are all kinds of business intelligence services out there, from Dun and Bradstreet to Bloomberg to TechCrunch. The diversity of services out there means there is tough competition but also proven market need.