To what end? You can use them as an extremely expensive cargo ship, sure. But if you're talking about launching drones off of our carriers, you have the problem that whatever you are in drone range of is also in drone range of you.
And btw, if you can get a submarince close to your target, torpedoes and missiles are going to be much more effective than drones.
Space is limited on platforms, a submarine might have space for 60 drones or 30 missiles, given the immense cost of the submarine, going with the missiles is the right call.
The trucks launching shaheds that iran is using can fit like 5 such drones, a similar truck could probably fit 2 to 4 cruise missiles the only reason they are using drones is the rapid production and cost associated with drones instead of the cruise missiles.