Originally Posted by songsc

Well, first of all, why would someone spend that much effort to cancel my ticket while getting nothing in return? If I knew someone hates me that much, of course I won't share any critical info with that person.

I am more worried if someone cancels my e-up, move me to the back of the bus, or ordering some weird special meals

The bottom line is, only share ticket number and booking ref with people you trust.