Not dubious, tor is used by all sorts of abusive spam bots and people who just want to shitpost for the lulz.
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User based voting solves both those problems without having to nuke the ability to post anonymously.
If almost all of your Tor traffic is abuse, exposing it to your users to vote on doesn't solve the problem, it just gives them a worse experience.
Obviously every service has different trade-offs to consider, which is why "Tor traffic is always worth it" is HN comment idealism.
How do you differentiate between legitimate new users with no record, and a returning shitposter's 10000th spam account with no record?
How do you differentiate between legitimate new users with a bunch of existing users vouching for them, and a returning shitposter's 10000th spam account with a bunch of existing stealth-mode accounts vouching for them?
I think you're using an extremely weak definition of "solve".
Although Reddit is not perfect, it doesn't seem to be a big problem there. Tor works and you can start posting as soon as you sign up.
reddit rate-limits new posters to something like 1 post every 15 minutes until they've accumulated some positive karma.
Yes, but they allow new posters to be anonymous by simply not blocking usage through Tor.