Well, their other "spin" on slicing Syberia is because it's a large file game, and that downloads are "difficult and time-consuming", but they have plenty of LFAs that are >1gb, including their big money-maker Mystery Case Files: Escape From Ravenhearst. The other addition is that the bite-size Syberia has a free trial version, something they normally don't offer with LFAs.
But basically, they wanted a multi-platform game.