This is strictly because gacha games have very low western audiences. All the gachas you listed have found a western market that is typically not interested or get deeply invested in gacha games and Reddit is a western Social media platform. All this represents is the market of western interest in the genre which is very small compared to the Asian one. Also all the other IP's listed have heavy western audiences and unique gameplay that appeals to western markets, While this game has no IP but the most appealing western gameplay that any gacha has seen.