It's ambiguous in CME's Rule 576 what a Globex Terminal Operator is. On the other hand, some brokers do send Tag 50 IDs assigned to their underlying clients, like Saxo Bank A/S. The broker was fined when the CME found the broker's auto-liquidation algo needed its own Tag 50 ID and may not use the IDs of the broker's clients, as it did.
Quote below from https://www.cmegroup.com/notices/disciplinary/2017/03/CME-15-0158-BC-SAXO-BANK-AS.html
Pursuant to an offer of settlement in which Saxo Bank A/S (“Saxo”) neither admitted nor denied the rule violations upon which the penalty is based, on March 16, 2017, a Panel of the Chicago Mercantile Exchange Business Conduct Committee (“Panel”) found that on multiple dates between January 2015 and March 2015, Saxo operated an auto-liquidation algorithm to liquidate its clients’ under-margined positions by entering a market order for the entire quantity of the clients’ open position. Saxo’s auto-liquidation algorithm entered orders without taking into consideration market conditions and, in at least two instances, caused significant price movements in certain CME FX futures markets. On its own initiative, Saxo promptly undertook remedial measures, including developing and employing a new and enhanced custom algorithm to liquidate under-margined customer positions, although Saxo continued to operate the algorithm before the firm completed and deployed the remedial measures. Additionally, during this time period, Saxo routed the market orders to the Exchange using Tag50 User IDs assigned to the underlying clients as opposed to assigning and using a unique Tag50 User ID for the algorithm. The Panel concluded that Saxo violated CME Rules 575.D. and 576.
