Without difficulty adjustment the attackers will just develop ASICs or other energy efficient devices inaccessible to normal users. Bitcoin fixes this.
Tor Launches Proof-of-Work Defense for Onion Services
"We are officially introducing a proof-of-work (PoW) defense for onion services designed to prioritize verified network traffic as a deterrent against denial of service (DoS) attacks with the release of Tor 0.4.8."
https://www.nobsbitcoin.com/tor-launched-proof-of-work-defense-for-onion-services/
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