People say WHOIS is useless these days due to WHOIS privacy, but it's useful for at least one thing: checking when a domain was registered/transferred. Fishy stuff tend to be registered/transferred recently. Also older and larger companies tend to not hide their organizational identity.
Btw, I tried the icann-rdap CLI tool and the default rendered-markdown output mode is atrocious. Sea of output, each nameserver has one or more standalone tables taking up 15x$repetition lines, almost impossible to fish out useful info. The retro gtld-whois mode is so much cleaner. Their web tool https://lookup.icann.org/en/lookup is fine too, don't know why the rendered markdown mode isn't like that. WTF.
Btw, I tried the icann-rdap CLI tool and the default rendered-markdown output mode is atrocious. Sea of output, each nameserver has one or more standalone tables taking up 15x$repetition lines, almost impossible to fish out useful info. The retro gtld-whois mode is so much cleaner. Their web tool https://lookup.icann.org/en/lookup is fine too, don't know why the rendered markdown mode isn't like that. WTF.