Thanks to obmreetsoleil for posting such a beautiful closeup video of Fortunate Sun! What a gorgeous yacht!
The canal she was being towed down fort lauderdale - Google Maps
is about 110' wide and 3,300' long with no turning basin.
There are numerous marine enterprises along SE 16th St and SE 15th St including Dockwise, Sunseeker, Cable Marine, YachtZoo, Vicem, SunDance Marine, Noruvania, Lauderdale Marine, Apremare/Muestro, Burger, Bimini Boatyard, Boathouse, 15th Street Fisheries, Charberlain Yachts International, and Ferretti Group to name some.
Consequently the canal attracts lots of boat traffic including mega yachts that are moored or being serviced along the canal. Currently Namaste and Victoria Del Mar II are moored quite a ways down the canal with Starship and Mary Alice II being docked just inside the entrance to the canal making maneuvering quarters even tighter.
IMHO for larger yachts like Fortunate Sun at 177' towing is the only safe way to make it down and back such a narrow waterway especially with any wind a blowin.
In this case I do not think Fortunate Sun was under tow because she was in trouble. Rather she was being towed to keep from getting in trouble.