Now it is generally difficult to find such a project, which will bring money in the future, this is a kind of roulette game

If you are an inexperienced investor, then Yes, luck is important here, and if you have long been in this business, then you are in no time to distinguish a promising project from a failed one.
Sometimes even a well-studied project can be frustrating, because a number of factors affect the success of a project, which may not be taken into account when determining the risks of investing in a particular project.