Firstly, it can too easily used for nefarious obfuscation - I don't want to be rickrolled, or sent to goatsex thank-you-very-much.

Secondly, it makes later searching easier. It helps my search if I can remember whether article X was on site1, site2. et cetera.

This isn't me laying down a new demand, just asking submitters to avoid an unnecessary practice.

Thanks,

K.