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How is this any different than not tipping with cash? Everyone behind you in line can see whether you put anything into the tip jar. Or is it that there's some plausible deniability that you can claim with not having cash which isn't present for card tips?

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You have to make a specific action to not tip in one. The other if you make they minimal amount of actions (pay for your item, grab the item) then you haven't taken the action of not tipping.

Also the visual difference between tipping 20% and 10% is huge with this, it's hard to tell with cash and change

and I tip 15 percent, not 20, so if there's no 15 option I just give 10. And that's only in a sit down restaurant I never tip if I'm not being waited on.

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