It is not surprising that projects are created on an idea that will have demand, otherwise investors and users will not be interested in it, everyone needs useful projects. High hopes are placed on advertising, while forgetting about development.
If the developers are engaged only in advertising, the development of the project is not their first place. And with such projects you need to be careful.
I do not understand why suddenly advertising is bad. And how to draw attention to the project? Only proper marketing can do this.