Why hasn't Greyhound (like Ticketmaster) been hit with a class action suit for its "gift fees?"?

Today I experienced firsthand the frustration that comes with discovering Greyhound's infamous gift fee when I tried to buy a round trip between Houston and Austin for my girlfriend only to have the price triple at checkout...

For those who don't know, Greyhound charges an $18 "gift fee" on any ticket purchase where the cardholder isn't traveling. The company's representatives offer vague, sometimes contradictory explanations for why this fee exists, with the most common being that it is a fraud prevention measure, but all of the known excuses have been shown to not hold up to scrutiny (there are some great articles on the subject if you want more info).

This got me thinking about a recent class action lawsuit against Ticketmaster, where they were sued and it was determined that some of the "service fees" they charged people weren't legitimate and they were simply pocketing the extra money.

This made me wonder, if such a suit could be successfully brought down on a company like Ticketmaster, why has such action not been taken against Greyhound? This is not a new issue after all, and there are numerous petitions and articles on the subject dating back several years.