In August some (e.g. [1],[2]) were writing about sites detecting private browsing, specifically the NYT, in order to block people who were using Incognito mode in Chrome to get around free article limits. Looks like Bloomberg now has this feature active as well.

[1] https://9to5google.com/2019/08/09/new-york-times-detect-incognito-chrome-76/

[2] https://www.bleepingcomputer.com/news/google/google-chrome-incognito-mode-can-still-be-detected-by-these-methods/