I don't think any whales are materially increasing their stake from Dmania.
This is simply to prevent people who add nothing to the platform from profiting and cashing out at low effort.
We're not really favoring big investors, just locking out those who contribute nothing. Have you looked at the size of the Dmania vote lately? Low percentages are not low reward.
"solution is required from the steem devs... But I fear that we won't see any movement"
Hence the need for suggesting such imperfect measures.