I have seen the cases where users were banned to participate in the giveaways which were not bitcoin giveaways so considering the experience I will not risk myself joining that kind of giveaways unless any mod gives a green signal here.
7 months ago, there are many familiar users in gambling were temp banned because of giveaways. Later theymos removed some of those bans but because it takes time to resolve and it is 7-days temp ban so some members simply waited for their ban expiration.
As many others I'm banned for 7 days