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The most basic rules commonly required everywhere. When you have such specific rules, it ironically actually makes finding the password through brute force easier because you can eliminate a bunch of variables that could have existed without all the rules. I can eliminate any permutation under 8 characters, doesn't contain a number, and doesn't contain a special character.
It will still possibly take a billion years to guess, but it could have been two billion without the rules.
Of course, I also find it wild that the metric for how good an encryption or password system is, is just how long it would take to guess every possible combination of input it could be, sequentially. It doesn't account for a brute force attempt that just selects random inputs. It could take until the heat death of the universe... It could take 3 seconds. It's up to chance at that point. Not to mention all the easier ways of getting a password. Like gaslighting the person who knows it into giving it up.
It's something like the second law of Thermodynamics. It's probability, not absolute. It's possible all the gas molecules in the room arrange themselves one corner, but it's fantastically unlikely. It's possible to choose the right encryption key to a 256-bit cipher at random the first time, but it's fantastically unlikely.