I guess you missed this part of the ToS.

exploit says it all as well as unintended advantage. Exploiting is the same as cheating and cheating is illegal.

exploiting alts to give an unfair boost to a groups activity rates, gnw participation, and of course, the advantageous acquisition of coupons. OG does warn/ban for this activity. If they do this then it's perceived to be illegal. In fact that is in accordance to your observed line '• Engaging in cheating or any other activity that OASIS deems to be in conflict with the spirit of OASIS.' Having multiple accounts is legal, exploiting the use of them is not. There is a difference.