Google’s and Yahoo’s vendors probably forced Yahoo and Google to make sure no one was downloading and re-using the data on their site commercially since those vendors impose such restrictions and they have been cracking down on web sites. So that in turn, Google and Yahoo probably imposed on Quandl to remove those services and stop deriving commercial benefit illegally from them—which they had no choice but to comply.
Indeed the data on Yahoo and Google (especially Yahoo’s) is decent quality but can only be used personally.
XigniteGlobalHistorical is a commercial service, not free but that provide even higher quality data and features such as automatic adjustments for corporate actions (splits, cash dividends, spinoffs, bonus shares, scrips and stock distributions etc.), automatic identifier stitching so that you can pull full history beyond the corporate action event, easy set of APIs to retrieve summarized intra-day/end of day/weekly/monthly/quarterly quote bars for analysis or charting, daily/weekly/monthly/quarterly historical VWAPs and TWAPs.
Check out Xignite API covering equities and ETFs trading on more than 50 global exchanges and history as far back as 1994 for US securities and 2000 for global exchanges.