a problem many people face is that people donate to them troops that they dont want, and there is no stopping people from donating you goblins or wallbreakers, the best you can do is kick them out after they have donated you a troops that you specificaly said not to donate.
i think a simple solution would be to be able to select what troops people can donate to you by have a bunch of options when you are requesting and you can click on all the ones you want
