Additional clarification:
No one lost a verification badge today–If you received an email that your channel will no longer be verified, this was just an advanced notice & you can appeal
The checkmark has never appeared on YouTube mobile channel pages (this will be added soon)https://twitter.com/TeamYouTube/status/1174735005215420416 …
What if a fake channel comments something inappropriate on a video that isn't from the person they're impersonating? Now the youtuber who lost their verification looks bad and since it's not their own video it's impossible to tell the real and fake apart.