For me it’s the paranoia surrounding webcams. People outright refuse to own one and I understand, until they go on and on about how they’re being spied. Here’s the secret - unplug the damn thing when you think you won’t use it or haven’t used it in a while.
They, whoever it is, can’t really spy on you on something that’s already off and unplugged!
No it doesn’t. It reduces the possibilities to less than the 52x52 possibilities that would exist if you allowed all possible combinations of upper and lower case letters.
You are confused because you only see the two options of enforcing or not allowing certain characters. All characters need to be allowed but none should be enforced. That maximizes the number of possible combinations.
No, because that’s still the same. An attacker can find out the rules by creating accounts and testing.