Why can you vote (up or down) every two seconds (again)?

Question

This is a follow-up of a two-year old question regarding serial upvoting.

I just got 4 consecutive upvotes in 4 seconds.
Yesterday, I have seen two other instances of 4 and 5 consecutive upvotes (in less than 5 seconds).

Each time, the answers upvoted are simply my last (unrelated) answers, taken in order, and upvoted without meaningful reason. In 4 seconds.

I still don't understand why serial up or down voting is allowed, while there is a mandatory delay on comment upvoting.
I understand, from this question "Why is there a 5 seconds limit for voting on comments, but not for voting on answers?", that setting a delay between each vote isn't popular.

But:

• if you serial up or down vote more than five answers, those votes will be rescinded the next morning
  (strangely enough, those upvotes are just below that threshold)
• I don't know anymore if my answers have been upvoted because they are helpful, or because of some automated process.
• Quickly upvoting several answers within one question makes sense.
  Doing the same for unrelated answers from different questions doesn't.

I would simply mention this here to make clear that:

• I have nothing to do with those votes (i.e. I don't have a sock puppet account ;) )
• I receive between 40 to 60 votes every day, so I wouldn't care if those votes were to be cancelled.
• I still believe that a small mandatory delay between each vote (for different questions) would be useful.
  But I don't pretend this is the only valid solution (or that it is even a "solution"), and I am interested in what you think about this situation.

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Update next day (April 6th):

Again, those are just my 5 last answers, taken in order, and upvoted every 2 seconds.
Somebody is playing with an automated process and/or API calls.
And I am not amused.

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Update (April 8th)

As usual: the last 5 answers are upvoted.

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Update (April 21th)

As usual, last five answer, in order, upvoted in 11 seconds.

Could this account be deleted already?

Answer 1

A 5 second delay would not do all that much to slow down a serial voter, and a much longer delay would also impact regular voting patterns. While I wouldn't oppose a small delay, I also don't see it doing much good.

Serial voting is much easier dealt with if there are many votes, so making it harder for the serial voters to vote a lot is not really helping. The way to deal with serial voting is vote invalidation and if necessary, suspensions. Rate-limiting does not help.

Answer 2

The problem is not the delay in voting. Serial upvoters would take that few seconds to vote. But many users would be unsatisfied to wait for placing some regular votes in a short period of time. It is the same for comments. Many complain about that delay.

The problem is the serial voting detection algorithm. It should be enhanced to notice if a user votes on different posts of a single user in very short time, even if it is just 4 or 5 votes.