They removed the estimated prize stat from profile?

Yes, they removed it.

Next step is to remove all giveaways and accounts

Its not like its really usable for anything, neat to think about I guess, but it does cause lots of confusion with people who have no idea what estimated means.

Also we already know....
http://www.steamgifts.com/forum/VuHe1/estimated-wins-disappeared
http://www.steamgifts.com/forum/wAdz5/estimated-wins-gone-its-backgone-again

it confused me a lot when i first joined. its not that important anyway

No announcement, so I guess it's just temporary, just like how our replies are disabled. Note that the site is running a lot faster now with the two disabled.

why did they do that?

i guess it was cuz when people see that they won less than estimated, they got mad, but now i'm sad cuz i actually wanna see how lucky/unlucky i am

I always assumed that was part of SG+; guess not

I cant live without it

I really liked it, especially since I had awful luck for a while so it was a way to feel like I had made progress without just getting disappointed. I hope this is coming back!