"According to the companies, the pilot scheme – which began in 2020 – demonstrated that paper cups can be shredded and used as material in some of Essity’s mills. This reportedly means that the McDonald’s paper cups are used to make Tork branded toilet paper.
McDonald’s Deutschland LLC claims that all paper cup waste from its sites will be recycled, apparently reducing waste by an estimated 1,200 tonnes per year."
Source: https://packagingeurope.com/mcdonalds-and-essity-collaborate-on-paper-cup-recycling/