I wish I would have seen this earlier and I tend to agree that the measure you propose would limit abuse, it would at least make it harder.
The other idea I came up with is that any account can only upvote any other account the equivalent of 2 - 100% upvotes a day. This would include yourself.
If you had a favorite author you wanted to upvote 4x a day then they would have to be 50% upvotes.
I believe that this would force people to find more good content creators rather then just relying on 1 or two high frequency posters. I also don't think it would hurt most established authors that much since the really big whales almost always only upvote with a portion of their SP.
This solution also isn't bulletproof but I think it is an improvement to how things work now.
Both solutions are prone to sybil attacks - setting up multiple accounts to get around the barrier.
True but it is still more complicated for someone to set that up then it sis now.
Not if you know what you're doing. It takes about ten seconds (and a few steem).
The only drawback to starting a second account, is that it then has to recruit followers.
Right, even if the net earnings are the same it would be much more difficult to accumulate followers and reputation. Which means it would be much easier for the community to take corrective action. In the case of this certain bad actor part of the issue is the large number of upvotes from lazy People looking for guaranteed curation returns.