Quick theory i made.

So this may be kind of stupid, but i believe the serverblight is like cancer in the source engine, an error that mutates and grows over time, now im uncertain about the way it infects people, since it wouldnt make sense for it to actually infect the player, but it could also explain why dicksalot is so worried and why jonydany feels cold, honestly i think it just works as a virus in the persons computer, having their steam account and other stuff related to tf2.