Thanks for this nice gesture!
Although it's a bit misplaced since content like that belongs in /doujin/ , right?
Anyways, rest assured. Everybody is well aware that these particular three doujin have been shared and are available throughout this board and other places.
Barachan is usually very swift in finding out when something is free online, so no worries there.
I most certainly don't trade with others for doujin that are available for free, nor do I get any trade requests for those of course, and naturally I'll inform trading partners about such issues so there won't be any trades "in vain" taking place ^^