It will delete {count, plural, =1 {1 video} other {<x id="count"/> videos}} uploaded in this channel, and you will not be able to create another channel or account with the same name (<x id="PH" equiv-text="videoChannel.name"/>)!
Your current email is <x id="START_TAG_STRONG" ctype="x-strong" equiv-text="<strong>"/><x id="INTERPOLATION" equiv-text="{{ user.email }}"/><x id="CLOSE_TAG_STRONG" ctype="x-strong" equiv-text="</strong>"/>. It is never shown to the public.