I see this behavior from time to time. I don't think its right, but I cannot remember any law, which prohibit it. So, I decide, when I will buy my big domain,

I see this behavior from time to time. I don't think its right, but I cannot remember any law, which prohibit it. So, I decide, when I will buy my big domain, will make checks from some hosting like cf, or just download full list of all domains I could consider, and run all searches locally.