Not to mention that Anycast and TCP can have some fun edge cases for users with chaotic routing and you also need to figure out how to do sticky L4 sessions / f

Not to mention that Anycast and TCP can have some fun edge cases for users with chaotic routing and you also need to figure out how to do sticky L4 sessions / forwarding, which can be hell to debug. (Or you could just ignore those users when they complain, PlayFab sure does.)