It's pretty easy to use - pugs can join with just a web browser link, no need do download a separate application. 
Their privacy policy is pretty sp00ky, clearly states that they collect and 
share lots of your data with 3rd parties, despite stating that "
The Company is not in the business of selling your information".  Read 
https://discordapp.com/privacy and it's quite clear. 
It's an okay program if you don't mind the obvious botnet.