So i have to be subscribed to freebitcoin advertisements?
If you go to your profile, you see that there are four kinds of subscriptions.
1. Payment notifications
2. Deposit notifications
3. Ad account Notifications
4. Promotions
TheQuin is the only one who can answer this and I am not sure, but I guess for receiving lottery winning notifications, you should need to subscribe for "deposit notifications".
Confirmation from support is needed, but if he receives daily emails containing free WoF spins, withdrawal and deposit plus FUN maturity notifications, he must receive a lottery winning notification as well, if he wins the prize.
I also heard once that when you win the lottery, a message displays when you access your account at freebitco.in, but since I've never won, I can't say exactly where the message is displayed.