I think it would be a good add, to have weighted giveaways. I myself do not stream but I do see streamers using your giveaway feature that wish it had some sort of weighted system not only for luck of subscribers/users but for times entered and lost.
For ex: the streamer starts a giveaway, 20 users joins 1 wins, 19 of those users will have a little better chance at next round and the winner goes back to 0.
This will allow overtime for all users to have a better chance at a giveaway. Just a suggestion.
Thank you for your time.