Bind account with mobile number to prevent people from creating multiple accounts
Right now people can create several accounts with just a new e-mail address (or delete an old account and create a new one). People that are harassing streamers usually does this, and it's unacceptable.
Twitch needs to do something about this, because it's gone too far. Bind accounts with a mobile number and let the owner change his/her name Once, because the name we chose 2 years ago might not be suitable today.
When a user register a new account on Twitch, they need to verify their identity with their phone number (for example sending a code via SMS that they need to enter to verify). And of course people can't just delete their account and create another one with the same number, it's locked to that specific username.
This will drastically reduce the harassment and bullying on Twitch.
Its Invis commented
Phone verification does sound like a good option.