Hydrofoil ferries have been in use for 30+ years in Hong Kong.

Hydrofoils have never taken off outside of tiny niches. Changing the propulsion from gas to electric does nothing for any of the advantages or disadvantages of hydrofoils other than making the disadvantage of ‘the boat must be as light as possible’ even worse.

A ferry is also one of the worst applications for a hydrofoil possible. Underwater debris like grass is a much larger problem and they have a massively increased draft when traveling at slow speed. Both of these are most acute when when pulling into dock near a shoreline…to ferry things.