Stop allowing suicidal ideation in usernames
Seeing anything related to suicidal ideation is problematic for many individuals with mental health issues. There are a number of usernames with some form of suicidal reference in the name.
This was used by some people shortly after the hate raid incident to target veterans with mental health issues, such as myself. Now, I continue to see usernames like this, whether targeted or not, and it is not something that should be allowed.

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Zombiepaper_ commented
Since seeing the new policy over usernames, I have still seen usernames that break Twitch's Community Safety guidelines like this. An easy way to resolve this problem is to ban words that are generally harmful to most people and specifically harmful to select groups. As one of the largest social media platforms around, this should be mission critical to keep the brand accessible to the most amount of people.
https://safety.twitch.tv/s/safety-news/detail?language=en_US&post=Community-Safety-Update-New-Username-Policy