Yes, fly larvae can be eco friendly. So what? I'm personally not trying to save the planet by keeping fish in a glass box. lol
My only interest in a fish food is it's nutritional profile, to which, IMO this food fails.
When presented using names such as "bug bites" consumers believe they are feeding insects (Black Soldier Fly) to their fish, when in reality they are feeding BSF larvae, along with a mix of potatoes. peas, wheat, etc. The nutritional composition of BSF larvae depend at least partially on the composition of their feeding medium, so what those larvae are fed on the BSF farm will partially reflect what their nutritional profile is. Obviously this will vary, as will the maximum inclusion rate in feed among various fish species.
These novel sources of protein are specifically designed to lower feed costs, by reducing and/or replacing fish protein. But at the end of the day, nothing truly replaces the protein, fat, and natural growth enhancing substances found in wild fish. Even in this product the second ingredient listed by weight is Fish Protein Concentrate. With regards to feeding fish, seafood such as fish, krill, shrimp, etc, along with aquatic based plant matter will always be nutritionally superior to fly larvae and potatoes, but at some point in the future the cost of those ingredients may outweigh their nutrient profile with some portions of this hobby. If the day ever comes that I can't afford to feed quality foods to my fish, I'll shut my tanks down and find a different hobby.