I’m not sure you have much to worry about. The possibility of someone deciding to field enough catalysts to kill you is not zero, but I would be surprised to see it happen or see it motivated by a public fleet.
Your clients, on the other hand, could have much more reason to be worried. If anyone can join the fleet, then that anyone can have a warpin on anyone in the fleet for no effort, and that simplifies the logistics of ganking fleet members with lower EHP totals than you.
If you’re looking for people to socialize with, though, it’s feasible this could play out in your favor. It’s also feasible, though, that people would be too afraid of the potential consequences to join such a fleet. I haven’t seen anyone try it so I am not sure what would happen. I would try it out and see what happens, but never fly anything you can’t afford to lose.