It appears that Verizon is starting to block hotspot tethering for consumers using jailbroken devices without data plans. A ReadWriteWeb employee using a jailbroken tethered Verizon Motorola X without a data plan was sent to this page outlining Verizon's hotspot data plans today when trying to access a hotspot. This is a new development, since the employee used her jailbroken device as a hotspot two days ago.
The move from Verizon comes the day after AT&T started moving jailbroken hotspot users without data plans involuntarily to tiered data plans. Verizon hotspot plans start at $20 for 2 GB of data when added to a data plan of $29.99 or more. Every GB after the 2 GB threshold is an additional $20. The move corresponds with U.S. carriers closing loopholes in their pricing structures to maximize revenue from data as voice and text messaging revenue decreases.