I think this is a terrific idea. But I am concerned with potential abuses. In addition to the rapid reduction of voting power, what if there was also limited number of uses or a cool-down period.
My biggest fear of this feature would be the bots controlling an army of spammed accounts that would all use the multiplier on a post. Maybe also limit the number of multiplied upvotes on a single post. Whether that be an absolute limit or a percent of votes limit.
Yes that could be a possible other rule or restriction but also blocking people from doing just because a bunch of low multiplier votes came in wouldn't be fair in a way. All hypothetical of course but yes I touched on added a "cool Down" type with only allowing 5 Multiplier votes per 24 hours