YOLOdice isn't a new gambling site. YOLOdice have been operating since year 2016 and I don't see or experienced any issues on their end. I am a gambler myself on their site, playing some of the bitcoin that I have earned on their campaign and I can vouch that they are operating smoothly which is something to be expected.

As far as I am concerned, gambling website who uses bitcoin as their medium of exchange does not really require a gambling license unless otherwise you are operating from a country where having a license is mandatory as well as when you are offering your services to other countries which also require a license. Although some of the casino are explicitly showing that they have a license, it doesn't guarantee that they will honestly do their job. Searching for a reviews here in bitcointalk is a lot more effective I think.

I wonder if these guide actually verifies the legitimacy of a license. I feel like it's too simple for a license verification process.
[1] https://casino-howto.com/blog/how-to-verify-curacao-gambling-licenses-easy/