With the recent inclusion of Cloud in MiniPlaceholders, the project went from less than 100kb to 1MB with the inclusion of Sponge.

There is no reason to include all platforms in a single jar, besides it would solve a possible confusion in the next release of MiniPlaceholders in Modrinth after the inclusion of Sponge, since in the Paper, Krypton and Fabric modules only 1.19.4 is supported, while in the Sponge module API 8, 9 and 10 (1.16.5-1.19.4) would be supported