I agree as mentioned above that marketing needs to be planned. Otherwise the money goes wasted. It is better to have an experts hands on activity for the task. Most of the time the finance people ( I refer gambling people as finance people ) are not much into the marketing so they would be needing help for sure. So its good to have a marking manager on board to formulate strategies.
I think every gambling platform has a marketing section and many other teams focus on the financial management section, so a gambling platform is not for a team that has the ability to analyze gambling platforms, but requires a team with financial management and marketing skills capacity which is also very important for the development of a gambling platform.