Games involving sexual themes are currently relatively niche, and their distribution channels are relatively narrow (even though the demand should be huge).
Therefore, most small groups or individual developers use membership sponsorship to support continued development. Publicly releasing a free version is the developer's goodwill and promotion method, and everything is based on the developer's wishes. To protect the interests of members, it is very reasonable to delay the release of the previous version of free resources based on the development progress. Players who get the game for free should be grateful and not unreasonable.