The specification is here:
https://usb.org/document-library/usb-power-delivery

USB Implementers Forum, Inc. is a non-profit corporation founded by the group of companies that developed the Universal Serial Bus specification. The USB-IF was formed to provide a support organization and forum for the advancement and adoption of Universal Serial Bus technology. The Forum facilitates the development of high-quality compatible USB peripherals (devices), and promotes the benefits of USB and the quality of products that have passed compliance testing. Some of the many activities that the USB-IF supports include:

https://usb.org/about

There is nothing stopping another company from competing with this tech, but most companies get on board because forcing your customers to buy specialized equipment like chargers and stuff is a bad move. Unless you're Apple that has historically strong customer loyalty.... well, 'had'. I think those days are gone.