Advertising is not the most important thing for a startup. Of fundamental importance is the quality of the product and teamwork.
Do you really think so? without a good marketing and advertising campaign, any even the most promising project will remain unnoticed by users.
I support. In such a huge market, how can you show your product without marketing? So many projects come out every month, that even if you follow them every day, you will not learn everything.
Some projects conduct closed sales for large investors and funds. Such projects are selling almost without advertising.