Well, technically, yes, but then technically every social consideration is a value judgement.
Besides, preaching is advertising. It's designed to increase the numbers of the parent organisation of the charity. Other things that are charity aren't designed to do this. Giving clothes to someone isn't designed to increase the numbers of the parent org.
Most people consider "strings attached" charity to be not pure charity. Not to say it's uncharitable, but that it's not 100%.
Besides, preaching is advertising. It's designed to increase the numbers of the parent organisation of the charity. Other things that are charity aren't designed to do this. Giving clothes to someone isn't designed to increase the numbers of the parent org.
Most people consider "strings attached" charity to be not pure charity. Not to say it's uncharitable, but that it's not 100%.