Genuine Apple products have been harvested for scams. That's a reality. Did they come from websites like this? We'll probably never know for sure. But it's not because I don't know with certainty that I'll go ahead and put my serial number on some random website.
That sentence does not mean anything. Pretty much everything has a theoretical possibility. There is a theoretical possibility that someone dies when eating glass. They might die or they might live. Even when evidence might say that the person will live, there is still the theoretical possibility that the person might die. Doesn't mean we should all go ahead and eat glass ¯\_(ツ)_/¯
Same thing here. No certainty that the serial number will be used for scams is not a reason to go ahead and give it out when the information that you want can be gathered without putting the unique part of the serial number on some random website.
Bye now!