"...WEI is an attestation scheme. It provides a way for a web publisher to add code to a website or app that checks with a trusted third party, like Google, to see whether a visitor's software and hardware stack meets certain criteria to be deemed authentic...."
"...The worry is that WEI could potentially be used to disallow ad blocking, to block certain browsers, to limit web scraping (still largely legal, though often disallowed under websites' terms-of-service), to exclude software for downloading YouTube videos or other content, and impose other limitations on otherwise lawful web activities...."
From:
https://www.theregister.com/2023/07/27/google_web_environment_integrity/
Also:
https://securityboulevard.com/2023/07/google-wei-drm-adtech-richixbw/
(You know that this'll be expanded and promoted as another anti-terrorism; anti-childporn; anti-disinformation; anti-"badness" process. The EU will embrace it; the U.S. and Canada will meekly follow. HEH! and we will certainly hear: "Why would you object to this if you have nothing to hide?"
I'd guess that banking sites will be first.)