The disappearance of a mod usually happens for one of three reasons:
When EA releases a DLC that mimics a popular mod (like Cottage Living did for many farming mods), the modder often retires the project to avoid redundant work. sims 4 all the fallen mods
Recently, many old-school modders have begun migrating their "retired" but functional libraries to CurseForge for better preservation. The New Guardians: Alternatives to the Classics The disappearance of a mod usually happens for