They monetize using nitro. Discord servers use multiple different servers based on location to host the actual chat services. I’m not an expert on the inner workings but it’s actually rather complex and fascinating. If you don’t like using discords clients then maybe try an open source alternative discord client, if nothing else it will give you insight into the back end and help you better understand what’s going on behind the scenes. Technically using alternative discord clients goes against their TOS but considering your feelings on discord I doubt that will matter to you.