The problem of abuse by community of free-ride users in decentralized networks with reward distribution is considered. Various structures for organizing nodes of a decentralized network belonging to the community of free-ride users, which can be used to obtain the greatest benefit in reward distributing in the network, are proposed. To compare the proposed structures, simulation of reward distribution was used. After analyzing the results of experiments, it was concluded that combining the nodes belonging to community of free-ride users into a structure of the "Generalized Ring" type with a sufficiently large number of nodes gives the best results from all the proposed structures.