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Vanity onion domains are usually created via brute force, yes, but it isn't something looked down upon. Heaps of services do this.

Is it really brute force when they had to put a big list of keywords in and make a backronym for whatever combo they happened to find first?

That's just brute forcing from both directions

Yes? From what I read they had an entire datacenter work on this for multiple days.

facebookwkhpilnemxj7asaniu7vnjjbiltxjqhye3mhbshg7kx5tfyd.onion is the latest

I would like to know how much pollution was created for that vanity url.

Would you?

You know (or could find out) the hashing algorithm. I’m sure you could come up with a model estimating “pollution” based on hash rate, kWh per hash, “greenness” of the energy source, and estimated hashes until a prefix collision.

Excited to see what you come up with.