I normally do as well except in threads like this one which are created for people who by default are happy to have edited versions of their images posted as part of C&C or help in aspects of image editing.
In the op it clearly states -
"PLEASE NOTE CLEARLY:
It is understood that unless the original poster specifically states that they do not want an altered image posted that you are free to alter the posted image and repost it in a reply for C&C purposes (no use for other purposes!). That reposted image may remain permanently or you may remove it after a short period of time if you prefer. No copyright disputes here!"
which clearly means this thread is mainly aimed at people who by default are happy to have edited versions of their images posted as part of C&C or help in aspects of image editing.
If someone does not want edited versions of their images posted they can simply follow the instruction in the above quote from the op.