A 12-word seed has approximately 128 bits of entropy, while a 24-word seed boasts 256 bits. When an attacker knows the unordered words of a 12-word seed, there are only around half a billion possible combinations, which is relatively easy to test with a decent GPU. A 24- word seed, however, has roughly 6.24^24 possible combinations - and that's a lot of zeros.
Basically all of nostr could try and we still won't get it. 😭