The argument is "Trust DDG". That argument is being attacked as "DDG's founder has done bad stuff in the past, it's likely DDG will do bad stuff, so I won't trust it". That seems to be attacking the argument to me, thus not an ad hominem.
The argument is "Trust DDG". That argument is being attacked as "DDG's founder has done bad stuff in the past, it's likely DDG will do bad stuff, so I won't trust it". That seems to be attacking the argument to me, thus not an ad hominem.
[My opinion on trusting DDG] - [Reason for my opinion on trusting DDG].[More information about the reason]
In this case, because I don't use the "personal attack" to reach my conclusion that the person was wrong, I don't think it would be a case of argument ad hominem.
But if someone read it like this:
[One reason for my opinion on trusting DDG] - [Another reason for my opinion on trusting DDG].[More information about the second reason]
Then I am using the "personal attack" to reach my conclusion that the person was wrong, so I think it would be a case of argument ad hominem.
My comment wasn't written very well, and I'll try to write better comments in the future. Not that adding an ad hominem to a valid argument makes it invalid, I guess?. But it's still good to avoid fallacies, and to write one's comments so they're likely to be understood the way one meant them.