This is technically true but practically irrelevant. A Spamhaus listing is the Internet equivalent of a sanctions designation and the process to get removed is equally as Kafkaesque as OFAC's. Not to mention the fact that addresses in the [DROP list](https://www.spamhaus.org/drop/drop.txt) effectively can't even connect to the broader Internet because every important tier1/tier2 uses these lists and drops all their packets.