There is no data metering or data limit to the cloud bonding service, using LiveU Reliable Transport or LRT. If you find any mention of a limit, meter, or cap, its outdated information!
Note that other services, such as Cloud Graphics, may be metered and this answer applies only to the LRT service, which enables bonding. Also very important, your data plan from any cell carrier or other internet provider may have data caps or limits, and that is offered and controlled via the carrier (and not via LiveU). Again, this answer applies to the bonding service itself, and not your modems or other bandwidth sources.