As far as I know eToro already allows users to copy other traders strategies. The incentive for the trader to allow others to copy their strategy is likely some

As far as I know eToro already allows users to copy other traders strategies. The incentive for the trader to allow others to copy their strategy is likely some % gain based on the number of copyers, so if you develop a successful trading strategy and allow others to profit off it, you also profit. Just a hunch.