Assume any service is a scam and only use services that contradict this assumption.
Scam checkers are garbage!
Tell me is this makes sense to you:
It is easy to manipulate them, as buying an old domain, some fake reviews, https, good domain registration data, and some updates will make your service 100% reliable, but these sites do not provide a review of why they updated the domain and whether it was sold or not, checking the quality of the reviews, Check for plagiarism or give a warning that these recommendations can be easily manipulated.