Yes, I think it's first avatar campaign for very long time. In my early days here I remember there was more avatar campaigns, but can't say that it was big thing there.
$1 is great deal, probably you can't ask for something better, considering that's just image without clickable link. Not sure how many people will be interested in this offer, considering that most of campaigns already ask to wear their avatar.
In 2023, when mixer campaigns were at their peak, almost every mixer campaign had additional slots for avatar-only participants.
The campaigns of the manager who opened additional avatar slots are generally not exclusive to the mandatory use of an avatar, so in some cases, it is allowed to use a different avatar in relation to the signature.