You are acting like a kid who don’t know how things are working with Free software
During the installation with one click you will not get a toolbar or sponsor or change search provider. (all Free software do that this is how they make money)
Desktop icon "Plus World" you can remove by simply delete it, what is the big deal about it anyway?
And the "service" is there to protect Messenger Plus! from other software like smiley central or Sweet IM who prevent messenger Plus! from working.
/ 
