It is somewhat concerning that this alliance has taken the exact same acronym as the existing Open Web Advocacy group, which has been instrumental in the DMA (and other global regulatory activities) coming into existence.

https://open-web-advocacy.org/

They are focused at the moment on addressing the fact that Apple has killed web apps in the EU - starting March 7.

https://open-web-advocacy.org/apple-attempts-killing-webapps/

Anyone who cares should connect with them.