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But it largely depends on this known list. Does it include all locking scripts whose unlocking scripts are known? Does it contain all addresses whose private keys are revealed, such as known brain wallets? Does it contain bitcoin-key-words, such as all block hashes, transaction IDs etc.? Does it contain predictable private keys such as k=1, k=2, k=3 etc.? From those, how large is the predictable private key range? It could be [1, 2^32]. Increase the exponent by 1, and you've approximately doubled the work. Then, you have a full node that must run 24/7.
A good bot should have some good infrastructure.