This sounds like we're in agreement. Valve's cross platfor strategy is only detriment to an outfit like ms who is trying to wall in users.
You say:
You prefer the microsoft deal but that doesn't make it a detriment to users in general. Playstation users can enjoy crossplay with windows, mac, linux or any other other system or service. The fact that xbox users have a different deal is not down to manipulation on valve's part but a decision on microsoft's.
If you prefer microsoft's offer, then you are free to go there, but to suggest that valve is negatively impacting users in a direct way is off base.