ive never made a post on here, so forgive me if i messed up anything.
conceptually:
If a user uploaded x amount of things, they could be considered "group a"
if a user never hits the threshold then they can be considered "group b".
if a user is group b, keep the default to avatar market.
if user is group b (or any other alternative), then let the default be.. not that.
  1. non intrusive to people who dont want to see it
  2. pushes market to people that will spend money on it
  3. reusable format for other types of content
used in a sentence: "you uploaded stuff! great job! im sure you are excited and are eager to go engage with that" and "you havent uploaded anything! maybe you arent interested or lack the ability to. either way, we got you covered!".
:3