AWS is probably the most expensive way to do this.

Either rent some machines from an ex-crypto miner, since AES can be decyphered on GPUs or get some old extremely cheap boxes from the hetzner auction.

They're still subject to economic considerations (assuming a non-state actor). If the expected value on a cracked account is less than the expected cost to crack it, a rational actor won't bother. That they may use cracked AWS accounts, or botnets, to perform this cracking does not change these economic considerations.