I have no problem with killing wild animals for food. The problem is that it doesn't scale well for 7B humans. And who am I to tell the next human that they don't deserve a spot in the living world? To me, lab grown meat is a relatively attractive compromise.

Also, it's unclear what their process is, but it's possible that these are cells cultured from a handful of fish, not lab growth from new zygotes. I'm fine with it either way, though.