Can someone do the math?

Hi guys,

Given all the hackers making the rounds brute forcing those wallets, what are the odds that they also come across a wallet or two that WEREN't Coldcard seed generated?

Like if their entropy is 2^50 but the entire universe is 2^256, what's the chance that a password from the latter rests in the former? Is it just 2^206? Also, it's unlikely Ledger or Trezor use the whole 2^256 universe, so maybe it's even lower?

Please discuss!