Recently a post was made by a guy named Mitch on his website on how to make YouTube Faster on Time Warner Cable. What people may not realize though is that blocking these IP addresses (below) will indeed block you from downloading on Google Play if blocked network wide.
This means you will be unable to update your apps if you have an Android phone or if anyone else attempts to and is of course connected to your WiFi at that time, again this only matters if you are blocking these IP addresses network wide from your router.
Sure, you can always switch to your phones network to update apps, but why use that bandwidth (and likely slower) if you do not have to as well as if you have a bandwidth limit or even unlimited. There are probably more services by Google that might be effected by blocking these IP addresses too, but I have not come across one yet or may have not realized yet.
The IP addresses that you are asked to block are these below. I have not tested which IP address it is specifically yet (lazy) however I believe it is the first one as far as the location goes.
Just simply remove these IP addresses from your router to simply regain back the ability to download from Google Play again. If you still continue to want to block these IP addresses and get a faster YouTube; if it works for you, then just block them on your each specific computer instead.