Utilize the input text as a context reference, choose the right relationship between Amex and American Express from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

However American Express cards are not affected by the rule changes for the moment so it could pay to switch to an Amex card, many of which offer cashback deals.

Answer: operator