There's no catch. It's just free on both PC and Mac.

Macromedia Authorware 6.5 here. Along with making the games free, Blizzard updated these perennial classics with a new 1.18 patch adding a few key features like the ability to toggle between fullscreen and windowed modes (Alt+Enter), an Observer mode, autosaves, improved UI layouts in Battle.net, improved compatibility with Windows 7, 8.1 and 10, and more. You can read the full patch notes. Proof The Very Best Of The Knack Rar.

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This shows a lot of confidence on Blizzard's part that people will still pay for the upgrade when the original games are free. As for the remake, this will include spruced up assets, resolution, audio, and story cinematics. You can see how it's evolved in the StarCraft Remastered trailer below.