FiveM - an 'illegal' roleplay modification for GTA5 - should it be allowed?

http://fivem.net

Here is an old artice:https://www.kotaku.com.au/2015/08/rockstar-has-explained-its-banning-of-gta-v-pc-players-affiliated-with-the-fivem-multiplayer-service/


What are your guys thoughts? Should people how have purchased the game be permitted to use this unofficial modification?