tl;dr: Don't use 1.1.1.1 if you use any services that use DNS geolocation to bring you resources from the closest datacentre. These include: Office 365, Netflix

tl;dr: Don't use 1.1.1.1 if you use any services that use DNS geolocation to bring you resources from the closest datacentre. These include: Office 365, Netflix, Facebook, Google services, ...