[GekkePrutser]

I think they put these holes in because otherwise they end up having to deal with tons of users complaining they can't sign into outlook/Hotmail etc anymore.

I use O365 for work and I've had to unblock a ton of MS crap in my pihole for stuff to work without VPN (we had serious VPN issues for a while). Microsoft apps are extremely chatty. Tons of requests going to azure, pipe.aria.microsoft.com. Etc. Tens per minute, no kidding.

[anonymous_tip]

Nope, none of these have anything to do with logins, i.e., Google ad pixel, Google tag manager, Bing ads, or Yandex ads. We're not talking about the entire domain here, but particular ad scripts -- if you click the name on the page they tell you exactly what path they are referring to.