It's not just Ramsey...pretty much every high-end eatery and celebrity chef has faced this type of lawsuit in recent years.
Fundamentally, there is a change occurring in the high-end restaurant industry as professionally-educated middle-class degree-holders who've been in the restaurant industry for 5, 10, 15 years (my brother among them) are deciding that it's no longer "what they're doing" but a career; they've begun to agitate for better wages, working conditions, organize, activists (most notably Saru Jayaraman, author of Behind the Kitchen Door and co-founder of Restaurant Opportunities Council-United) have begun to use media to draw attention to the treatment of restaurant workers and labor lawyers are beginning to pursue litigation to advance better working conditions. (Better protections of legally-mandated break times, a rise in the servers minimum-wage, overtime compensation, tip protection(not so much a high-end restaurant concern as fast-casual restaurants. Places like Starbucks have faced litigation over how tips are handled...specifically that Starbucks (and most of the sector) was splitting managers and shift-supervisors into the tip distribution as they were working the service line and serving customers.))
I like Ramsey, he's one of my culinary heroes...but I stand behind restaurant labor.