Google has invented a technology called FLoC that uses the Chrome browser to profile users, because third party cookies seem to be going away.
This technology is heavily frowned upon and a website or application can send a
Permissions-Policy: interest-cohort=() header to opt out of this.
We think that advertising is an important cornerstone of the web in 2021 but of course there are a lot of communities that see this as a large privacy issue.
The fastest way to opt your Discourse installation out of this is to add a
meta tag in the
/head of a theme component: EDIT as @supermathie pointed out, not sure if this will work.
<meta http-equiv="Permissions-Policy" content="interest-cohort=()"/>
But maybe this could be a ‘real’ HTTP header controlled by a checkbox in core.