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Is it really an ad hom if he doesn't know the hom?

Their reply is 100% based on the content of your post.

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If you make up a person to insult then yeah it's still ad hominem.
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If you're donating, then you are evidently willing to pay without any "buts". So aren't you arguing against your own actions?
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Not at all. I donate to Internet Archive, but we're talking here about paying for unobstructed access to but one part of their service: Wayback Machine. Two different things.
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