I'm sorry, this is a nitpick thing, so feel free to ignore it, but I notice it each time I get a notification that I've lost a giveaway (which is all of them so far, but I'm still holding out hope lol).

"Unfortunately, the prize draw for X's giveaway of Y has come to an end and you haven't been selected as a winner this time around."

The placement of 'unfortunately' at the beginning makes it seem like it's applying to the fact that the giveaway has ended, not to the fact I haven't been chosen. A small change would clarify this:

"The prize draw for X's giveaway of Y has come to an end, and unfortunately you haven't been selected as a winner this time around."