After participating over and over again over the past days finally I got picked by the rain bot, haha. I mean it's not a big amount of course, but at least it's something. You have to participate each round (every 30min) to get a chance to get picked, but at least you don't have to be active in the chat as on other sites.

I guess Winna must use their criteria for picking users for their rain drops as it does not make sense to drop rains to inactive or even abandoned accounts. Be active in chat box might not be the only or main criteria but Winna must randomly pick rain drop receivers from their lists of active users at Winna.
Not that huge mate but congratulations on your win. Well, persistence and consistency will be the key to that but I think that wouldn't be for me who got a lot of responsibility to do but would be fine and worth a try I guess to participate it some of the time on my free time. Let's get lucky!
Rain drops, airdrops, bonuses need to be treated as small gifts for enjoy and play games for fund and exploration. People should not expect to receive a fortune from rain drop or win a fortune from rain drop spins. Keeping up their hope too high but unrealistic like this can make them unnecessarily disappointed.