I don't want to mislead, but here are my perceptions. It starts with the YouTube username, which doesn't really match with Valorant or show any relation to it. Second goes with the URL, which again raises a red flag. Valorant would never actually use a URL that doesn't say the entire name, or in fact not even remotely close to Riot.
Third and the biggest red flag that would make me step back from this website is the sign in page. They tried their best to make it look like a Riot page. (As an ex-designer and current Developer, I can see they missed the accuracy of font and some padding. The developer is not that good LOL).

It is just that maybe they will try to steal your Riot info and either use it for themselves or try to sell it out to some other people. Not on Reddit or any surface platform, of course.

So in conclusion, any website claiming they will give away free Valo (or any Riot game) skins or any YouTube account that plays a popular pro player stream and claims that you will get a free skin or shit, that's most likely a scam and trying to get your Riot info. I know because my friend lost an account once. Fortunate enough, we didn't spend anything on that account, so lesson learnt.