Xandr looks set to be the latest casualty of AT&T’s extreme slim down operation. Disposing of WarnerMedia’s advertising unit for between $1 billion to $2 billion would certainly help AT&T’s drive to offload $10 billion in asset sales by the end of the year – if only there were some prospective buyers. Xandr has evidently not met AT&T’s growth requirements – encountering both technical and monetary difficulties since AT&T switched its focus from display advertising to video. This is part of a larger stream of cuts for AT&T, which is entering Q3 with $152 billion in debt. Faultline has previously reported on the widespread speculation that the company’s satellite unit, DirecTV, and WarnerMedia’s anime OTT platform, Crunchyroll, are also heading…