Huge numbers of fake follower accounts have been created using channel names.
So overnight some entity has created thousands of Twitch accounts using streamers channel's name. Here is a screenshot of what it looks for one of my channels on Twitch.
The format for the accounts appears to follow a pattern, its basically a streamers channel plus a random combination of one to three digits or letters. Some are also using pictures, avatars from established streamers in the profile.
Please be aware its not the channel owners doing it, if you get messages, alerts, /raids or whatever from channels that are following this format dont take it against the streamer.
Who exactly knows what the entity is planning on doing with all the fake accounts. Hopefully Twitch will investigate and remove these accounts from the system.
How to check if your channel was effected is by using the search function on the Twitch website.
Put in your stream name in the search bar and then click more on the channel section. Here is a screenshot to help you see where to click on to show more.
Again, be careful when clicking on things inside chat rooms, this entity maybe will try to post links with similar channel name to get viewers to click on them. It maybe a smart move to banned all accounts you find during search to prevent something like that from happening inside your chats.
Update - 8/19/2018
Checked to see if any of the new accounts have been removed for 'gamingwithdaopa' search and I still see a total of 30 or so fake accounts. We are speculating the entity that is doing this account generation is trying to obtain 'free subs' from Twitch's new gifting option. I believe if they get a free sub, it may whitelist them inside that channel which will then allow them to post fishing links or other problematic links inside chat rooms.
It maybe time to prevent all URLs from being displayed in your chat unless its been reviewed by a moderator or channel owner. When reviewing links, pay attention to misspellings for domain names, and get a handle on URL shortener that will cloak links.