coinmetro and parsiq are partnered and both are all about compliance, regulation and so on, so to worry about your docs, Coinmetro is probably the most legit out there!
Credibility of coinmetro is not the issue here but rather your giveaway method. You are requiring to deposit and KYC your participants for a
CHANCE only to win. Your requirements is not easy to provide since it is very valuable. Why do you think participants will waste time to participate on this so called giveaway if the prize is not guaranteed. The prize is not worthy enough for requirements tho.