What you guys are describing is nothing new.
It existed when classified where in newspapers.
Some people will arrange something, and change their mind.
Some people will come to the meeting, see the other party and decide they are not a match after all. Or simply get cold feet last minute.
Some will see it as a game, toying with people for the sake of it. Pure cruelty.
Some will have other motivations or modi operandi
It comes with dating by proxy of some communication media. How many time do you think Moses got stood up at Mount Sinai?
Someone said :
Whats the point of going on the system and registering if you are not going to bother with like minded people.
You have your reasons/point: they have theirs.
You cannot expect them to be you.
Some will do it gently, some will be rude, some will enjoy to see others suffer.
Just be happy that you do not get to meet these people! By definition they are not a match