Casting a net is actually one of the less sustainable ways to fish.

I am starting to see this lazy response pattern on HN. Someone makes a reasonable comment, then a responder pops-up like a whack-a-mole to say little more than: "That's not true." or "That's still bad." ... while offering no evidence to their claim, nor any reasonable alternative. I think that it adds so little to the conversation. And specific to the comment, they even used the Holy Grail of annoying Internet argument tendencies: "actually".

Compared to throwing bombs in the water?

depends on how big the net is. some of those huge trawllers do lots and lots of damage.

tempeh can be crazy toxic if spoilt. there is coconut tempeh which is officially banned due to potential for toxic contamination, but which is still super popular -- and routinely kills a couple of people every year.

Think you might be casting too wide a net there. It certainly can be.

Which sort of net casting? I grew up with a hand-case 8ft diameter net. I'll guarantee you that's a billion times more sustainable than a trawler.