I'm involved in setting something up like this in Australian waters.
I imagine one day, if your idea really takes off, we could abstract away our fisheries activities almost entirely (for most businesses), simply doing our fishing in "The Foam". (The Foam is really just other people's water)
FWIW, I read this paper which says that whale-watching is not unethical provided certain protocols are observed.
There are seventy five resident orcas in the puget sound. Seventy five. Their lives are disrupted by 100 years of industrialization and we’ll be lucky if they’re here in 2121.
For what it’s worth I went on a whale watching tour a few years ago. I regret it.