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As you can see for yourself by checking their Steam pages, Fallout 1, 2 and the spin-off Fallout Tactics: Brotherhood of Steel are not being sold on Steam anymore, though apparently Bethesda is working on getting them back to the service:
We're working to return classic @Fallout games (1, 2, Tactics) to Steam and will provide an update when they're ready to go.
We have to remove existing publisher info, legal text, etc.
As for whether the games will be back on GOG any time soon, it looks like it's a possibility rather than a certainty:
we'll have a look at other options once we handle Steam.