We have a small business with offices in both US and China. When flying employees to the US for business trips, I often recommend United flights and help the employees create and manage their MP accounts (taking care of expiration and award redemption for them). The miles are the employee's to keep. They usually just leave the miles in the accounts. Occasionally one may sponsor another employee's upgrade, or redeem an award ticket for friend/family.
Last week all our employee accounts were closed in a sudden. Only one employee received a warning email from United, saying that the accounts were managed by a single person and that was a violation of the MP rules. A total of about 10-12 employee accounts were all closed and miles confiscated without any warning. When I called MP customer service to ask, the agent said that she could not do anything about it. This is just mad! I look like a fool recommending our employees to fly united because of "better" FF program.