Its just as arbitrary as "why do you like me?" "we happened to be in the same bar, which is randomness+a bit of factors based on our personalities" just because

Its just as arbitrary as "why do you like me?" "we happened to be in the same bar, which is randomness+a bit of factors based on our personalities" just because a computer is not causing you to randomly meetup at say a party, bar, concert doesn't mean its more or less based on randomness + a few factors based on your personality, location, age, etc (more or less what dating sites use)