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"/>)!
Moderators of <x id="INTERPOLATION" equiv-text="{{ instanceName }}"/> will have to approve your registration request once you have finished to fill the form.