It's possible to be predatory without holding people at gunpoint.
Even for a more "traditional" franchise, where the franchisee is responsible for all the start-up costs, even $50k is small peanuts compared to the full cost to bring the restaurant up from scratch. Calling that "predatory" feels like a gross exaggeration.
Also Quiznos collapsed and was blamed for one franchisees eventual suicide due to their predatory tactics that locked franchise owners into paying high ingredient costs that they could not make a profit on.