This is 50% of the reason, the other half is that all the tracking/ad requests hit an API endpoint on bloomberg.com (no dot at the end), which is now a separate origin as far as the same-origin policy is concerned. But the code is not expecting this to be the case, and doesn't set any CORS headers on the response, and the browser denies access to the response data.

This breaks the ads but also breaks any interactive charts, etc. that need data from the API.