It certainly is suspicious, I'd advise looking into who owns the domain, tends to be a good way to gauge legitimacy.
If the guy is anonymous then you best avoid it, otherwise I'd suggest looking into their background and online activities, can't be too careful these days.
If that is related to cloud mining, then it's no need to check who owns the domain because as we know, that cloud mining is not profitable and will scam us in a short time. It is better to stay away from every cloud mining because cloud mining will scam in someday, and you are hard to reach ROI. That is enough for you to leave the cloud mining and never make a deal with them.