Crowlers were popular at some craft bars in Dallas. State cracked down as they ran afoul of the packaging laws. Apparently the packaging laws spelled out that a different type of license was required for canning and bottling. Crowlers are considered cans, obviously. Growlers were not included.
The original laws were intended to prevent people from packing a breweries beers without authorization.
People were all bent out of shape about it, but I never heard anything about people actually trying to modify the law to allow them.