Ive seen something very similar, probably the same as the Kochi one, in service in St Petersburg Russia. I’ll have a look when I get home and see if i can post a picture.
There was another one tied up in Kochi but in a similar state and didnt see any in service.
I believe they the ride is a little rough and they are known, at least in St Petersburg, as ‘Vomit Comets’.
I think its a characteristic of all hydrofoils.