Quote - the natural assumption for freebies here is that:

1. they're free for non-commercial use
2. give the freebie creator a percentage of sales for any commercial use

AFAIAC there's no need for the freestuff providers to hafta spell that out.
it's too obvious for words IMVHO.  like if ya leave yer keys in yer morris mini,
it ain't necessary to put a sign on the window saying "please don't steal my car".

...not to mention that really, on a moral/karmic level? If I made a ton of dough off of selling images made w/ others' freebies, I'd at least want to compensate them for the work they put in - even if it's a small percentage, or just a 'thank you' card.

In programming, you simply do not use others' code, unless you know up-front what the license is all about, and you're willing to adhere to it (or 'them'). If the freebie comes with none and you're doing a potentially commercial product, then don't use it... period. How hard is that to grok?

/P