Walmart is one of if not the largest US Corporations in the top 2 % tier of which the President wants to increase taxes apon.
They most likely could purchase UPS in petty cash, and UPS employees have the umbrella of Union protection.
This petition is a move to secure and protect the hard working under paid Walmart team members, providing more hours of work, more competitive wages, work place safety, better health and medical insurance, profit sharing and overall job security.