Ok, thank you for the clarification!Ok so user tokens are essentially a discord account username and password in a key so you don't need to login. It is then used by a script which can do a number of things. A DM script takes user inputs and auto joins guilds and whenever a user joins that guild it uses a user account choosing a token from the list and it can DM the account that recently joined the server whatever you want.
This is often used for mass advertising of anything pretty much.
TLDR: User tokens are used for self bots on discord
