#GoogleChrome is going to keep third-party cookies turned on by default, but it's pretty easy to turn them off (along with other ad features) by putting a "managed policies" file in the right place. Saves having to remember to do it for all users and profiles. (And there's a similar file to control the built-in ad features in #Firefox, too.)
https://blog.zgp.org/turning-off-browser-ad-features-from-the-command-line/