I am not sure. I know att wireless data has some type of disclaimer that data speeds are not guaranteed.
I am surprised verizon put 5-12mpbs as the typical lte speed straight on their official webpage.
Well, to be fair, that particular page doesn't really seem to be any type of terms of service or contract page, simply an informational one with marketing mixed in, as most informational things often tend to be. It doesn't seem to guarantee anything or say that it applies to any specific terms of service (as far as my quick read of it went). Furthermore, it seems to be a page for business, and given that Verizon has separate business plans and services, even if there was some implication there of a guarantee or some sort of terms, they would likely go as far as relating to some types of business plans which can be somewhat different than consumer ones, even if just in some sort of terms and nothing else (although as I recall various business plans can and do offer various things that aren't available with consumer plans).