Its because there is no free/OSS alternative that is as good. - Good RBAC controls for managing your community and making sure there aren't bots - Nice API acc

Its because there is no free/OSS alternative that is as good. - Good RBAC controls for managing your community and making sure there aren't bots - Nice API access for building bots - Free without any necessary system administration overhead Discord is just an easy to get into system to start a community without any large commitment on hosting.