>>53130815Four reasons.
1. People like big tits and her design works well with them.
2. The "big tiddy goth GF" meme was in full swing during her popularity.
3. She sells moomoo milk in a region where Miltanks aren't native... leading to lactation jokes, which in turn leads to huge boob jokes.
4. The three previous reasons together solidified her status as memetically having humongous milky tits, and once established as part of her design it never went away.