It's most frustrating with phone numbers. I picked up the habit of searching the random numbers that called me, to try and find out if they were possibly important. I used to get a bunch of spam sites that clearly existed to profit off me making those searches.
Both Google and DDG have removed those spam sites, even though they were useful at times. Google will tell me the number is in some random PDF that contains a few of the digits, then no other results. DDG will say the top result is my local police department, something that freaked me out the first few times.