Wiley
Similar to CUP and IOP, Sage, and Springer Nature, many UK institutions have signed a contract to fund Wiley's publishing activities for four more years as a result of Plan S, regardless of how many authors accepted manuscripts (AAM) are openly available in repositories. This fact undermines the arguments made above by the STM Association about the rights retention strategy (RRS) undermining financial sustainability.
Furthermore, the financial credit cap for the Wiley deal is operationally low, resulting in additional expenditure for institutions at the end of the calendar year when open access support funds are running low. This additional cost is not sustainable for many institutions and unintentionally creates inequitable access to no-additional-cost publishing.