Stop being a condescending a-hole.
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The game doesn't provide any stats which may be perceived as negative in any way, like donation ratios, for example would you like people to see your war win ratio?
Also what is it that you would classify as 'abandoning', as I have stated some wars the clan is ok with not attacking for whatever reason, now if you were a part of a war clan in a clan family you would leave or if you were just visiting a clan and decide to do a war with them or something, and then still be classified as 'abandoning'.
Read my post again. How will holding someone hostage help you win the war?
This is what I would do if I was forced to war with you. I would switch to my "I give up, free loot" layout for an easy 3 star. Then I could do one of two things: 1) I could just not attack at all or 2) Attack the two highest bases that already have a star... that I can hit for minimal troops. So I don't contribute a star to the cause but if you win, I get maximum loot for minimal effort.
Holding someone hostage is not the answer.
And Supercell is as unlikely to add a negative stat as they are to allow you to filter next's based on loot available.