By default, when someone creates a Discord server, the server’s members will be able to post media content in its channels without the media being scanned for explicit content. However, a server’s administrators can change this by turning on Discord’s “explicit media content filter” for the server. This filter has multiple settings to choose from, which will allow administrators to decide which users the filter will apply to.
https://www.adweek.com/media/discord-how-to-turn-on-the-explicit-media-content-filter-on-a-server/