Everyone is free to have their own criteria for (not) upvoting any content. I don't check the ratio, but some others do, and curating initiatives might have implemented it as one of the parameters to check.
And I understand it - supporting a person who withdraws most of the rewards is hardly the best approach in the long term - you want to build up a community, not a bunch of people who have it as a side hustle, and don't really care.
Your HP is your skin in the game.