If you're talking about Centralized exchange and the developer is submitting to a top-level exchange they need to prove that their coin or token has potential in the market and you need funds to list their token, the top exchange has its own criteria or requirements, and the coin/token must have a huge and supportive community that will sustain volume on the exchange where it will be listed.
CEXs may also have specific requirements or criteria for listing, such as a minimum market capitalization, a certain level of liquidity, or a track record of trading volume on other exchanges. In addition, the coin or token must have a strong and engaged community of users and investors, as this is a key factor in ensuring ongoing demand and liquidity on the exchange.