It is confusing. If you have two apps on your phone that do the same thing, how is the new user supposed to know what to do? I’m thinking of Samsung and how they insist on shipping their own branded stuff that, for the most part, brings nothing new to the table.
This has a lot more to do with consumption than with production. Most of these islands are small, and it’s unrealistic for them to have large populations or a heavy tourist industry without desalination plants. Energy needs to become cheap, and honestly, wind farms and solar can help with this.