What you are also seeing there is HR departments competing with each other for rankings in "best graduate programme" tables in the press. Which they may be incentivized to do by their own bonus system.

I totally agree about Google - they are basically the same model as a law firm, highly talented fresh graduates working long hours, but with one glaring exception: it's still possible to be made partner in a law firm. Google isn't minting any more millionaires this long after its IPO.