Come Monday, AT&T will begin restricting more than 16 million broadband users based on the amount of data they use in a month. The No. 2 carrier’s entry into the broadband-cap club means that a majority of U.S. broadband users will now be subject to limits on how much they can do online or risk extra charges as ugly as video store late fees. —Shed a Tear: The Age of Broadband Caps Begins Monday | Epicenter | Wired.com.