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Aspie96 | 1 months ago (raw) | root | parent | reply | flag 
 PoW is also not a verification system.
Spammers are more than willing to pay to spam better. They will even buy batches of email addresses, run bots etc…

Spammers pay. "Normal" users, commonly, do not.
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pippellia | 1 months ago (raw) | root | parent | reply | flag 
 nothing is a perfect verification system.

However, verifiable cost kills 99% of bots, which might be enough.
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Aspie96 | 1 months ago (raw) | root | parent | reply | flag 
 Why do you think so?
Again, spammers are absolutely willing to pay. It's by paying that they have become so prominent on the web. The fact that the cost is "verifiable" doesn't make much of a difference.
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pippellia | 1 months ago (raw) | root | parent | reply | flag 
 Just look at Twitter. I would say 99% of bots haven't the blue check.

It's a matter of economic margin.
There are spamming methods that are economical at 5¢ that aren't at 10$.

And, this PoW stuff that I am talking about, is to be used to help a new user bootstrap his own web of not spam.