hi，I found that someone use your artwork and ocs to make stickers for sell. here is it. item.taobao.com/item.htm?spm=a… you might find your oc is on one of these things. your artworks are also in these stickers. item.taobao.com/item.htm?spm=a… I am so angry to see those people sell your artwork as stickers without permission.
I allow my art to be used as bases on a case by case basis. Some vectors take hours to put together of hunting down multiple screenshots and parts to put together, then more time actually creating the work. I do not like that work so easily recreated with a base, so it depends which pieces you wish to use.