For what it’s worth, the reason that Lure of the Temptress is available for free is that the developer Revolution Software made a deal with the developers of ScummVM: they’d release both of their older and less marketable games, Lure of the Temptress and Beneath a Steel Sky, as freeware if the ScummVM developers made the newer Broken Sword series playable on modern PCs again. I believe they didn’t have the resources to do it themselves at the time. There’s no restriction on redistributing them so long as you don’t charge a fee for it, so they were an obvious choice for gog.com to include.