I think in this case it would be difficult for them to do, other than offering crippled games or some sort of optional Games For Windows "enhancements" to entice folks - but that wouldn't be harmful.
Yes, that's my fear: That there will be parts in the Code that "phone home" after about a month, or that you need a GfWl-Account for the added Features.
Also, OMG, Mechwarrior 2:Mercenaries. Want. I think it's Microprose, iirc -- I used to multiboot with Win98 just because I couldn't get it to run in XP or Linux, and I loved it that much. Only mech game I've played where it actually feels like you're piloting a huge, lumbering mech . . . and I liked my custom midrange sniper mech build. :-)
Well I looked it up:
Activision was responsible for the MW2 series.
Microprose did the MW3 series and Mechcommander
and Microsoft did Mechwarrior 4 series and Mechcommander 2.
So yeah, I was mistaken with Microprose
Anyhow, I'd like to have Crimson Skies, but my favourite would be the Hitman series.
The first Part was censored (forbidden) in Germany.