1) grade 10 nodes exist, and are usable, therefore they are legal
2) the whole abandon issue has already been addressed in a dev post and has been declared 100% LEGAL
3) donating leves is also legal, after all, the whole point of leve linking is to boost sp gains as a group, the only thing thats wrong here is someone is hurting themselves in the process by dropped after(the same result coulda been gained by just finding another person and them staying in the group too)


addressing SE to find out what is and is not an exploit is good, but some research into MANY MANY past topics to see if SE has responded to them already is in order