Yes, there is a share of marketing. But it is much stronger if there is the trust of the community in the future development of the project, a strong team work. This is something that can increase the community.
Listing without a foundation will create short-term interest. Of course, if there is both, then of course in the aggregate, it is more interesting.
If there is a listing of a hopeless project, then traders will trade little with this coin. They are first interested in the project and only then begin to trade in a coin.