If there are a total of 2256 combinations. one combination of 24 words has the same chance of being picked than another combination of 24 words. This probability is 1 out of 2256 whether how it was generated if each word was picked randomly.
Assuming that we are 10 billion people on this planet, we all decided to use Bitcoin and each of us had on average about 2000 wallets (which is a very large number), the sum of what we will get is 2.0e13 which is very far even if the wallet contains 12 words.
The problem lies if these words were not randomly chosen, and then the human brain gets used to choosing similar things and with the possibility of repeating more than one word, we will find that this possibility has become very weak, especially if social engineering is used to determine the words that you may use a lot, and therefore you will choose them to be seeds.
it is better to assume that any wallet that you did not generate or generated using your brain, or that is not randomly generated well is a hacked wallet.