I do not to think too deeply about  why people put restrictions on use of their freebies - if there are any restrictions on rendering I don't use the item.  There's plenty of good stuff around, and without it this would be a prohibitively expensive hobby.   The galleries on here and on other 3D sites would be a lot poorer without free stuff, so IMO freebie-makers should be a 'protected species' and moaning about them should be considered as being in poor taste.

If terms do not suit, move on and use something else.

Many thanks to all freebie makers - including the big guys like DAZ!

Regards
Peter
PS at one stage I was looking for a tomato ketchup bottle.  I found one for sale at $30, and to use it commercially one had to apply for permission from the trademark / design proprieters, i.e. Heinz.  Sounds daft at first, bu then I doubt if Heinz would be too keen on somebody producing some work that denigrated their product.
No, I did not buy it!