Project development costs a lot of money. Do you know how much a good programmer's work hours cost? Now imagine how much does the work of a team of programmers cost? And even more so as a rule, development lasts more than one month ... Therefore, IT projects always need a lot of money.
Programmers today are probably one of the highest paid professions. But in the case of project Greencoin, I think that many people come in or make a substantial discount or even help for free. All the same, Greencoin is aimed at a very noble mission!