This is actually something that the Factorio developers (mentioned in the comment you're replying to) have had a lot of issues with. See "The Grey Market" (https://www.factorio.com/blog/post/fff-171) or this article: https://www.pcgamer.com/factorio-devs-take-g2a-up-on-its-cha...
This is actually something that the Factorio developers (mentioned in the comment you're replying to) have had a lot of issues with. See "The Grey Market" (https://www.factorio.com/blog/post/fff-171) or this article: https://www.pcgamer.com/factorio-devs-take-g2a-up-on-its-cha...