“At Grubhub, we're committed to transparency so that every single day diners, restaurants and drivers can make well-informed choices to do business with us,” a Grubhub spokesperson told National Restaurant News.

The California Department of Financial Protection and Innovation is requiring four more types of consumer lending firms to register and turn over data to do business in California.

But others fear that many players are reluctant to speak out in case it jeopardises a lucrative move to the Saudi Pro League, and also that it is difficult for footballers to take a stand when governments are prepared to do business with Saudi Arabia.

But it boasted a potentially enticing feature: the chance to do business with a firm partnering with and promoted by none other than Donald Trumpov.

“We’re not chasing anybody and going, ‘Oh, please do business with us.’” said Klarman.