Registering any of these boxed games on Steam got you access to all of them: HL, Opposing Force, Blue Shift, Counter-Strike, Team Fortress Classic. + some Valve made mods: Quake DM, and Ricochet.
That's a pretty good "carrot" to use Steam if you ask me.
Re:Epistle 3
by philliphaydon on Friday August 25, 2017 @11:31PM
(#15103914)
That may have changed after I got steam.
I only had Half Life, and Counter Strike was free when I started playing so I only got HL / CS. I didn't get the others free until HL2 came out...
This is what you should have got with any retail HL CD key:
https://steamdb.info/sub/1/apps/
I can confirm it worked with HL1, CS Retail and Blue Shift keys.
Re:Epistle 3
by adamrezich on Friday August 25, 2017 @02:47PM
(#15101101)
Still waiting for Ricochet VR.
Steam came out 1 year 2 months before Half Life 2.
They didn't really 'bribe' people, it was more to do with 1.6 CS only working on steam and patching was done via steam.