I buy fake crab salad in the deli at my small town grocery. I know it's not crab. It's some sort of fish. They label it as seafood salad. But it looks like crab. It tastes like crab. And it's delicious.
If I was concerned that it wasn't crab, I wouldn't buy it.
Tuna, on the other hand, is cheap as hell. Which is why this doesn't make much sense.
Hake
Its Pollock. Not Polack... ;-) , Pollock. They process it and make surimi... ( https://www.seafoodhealthfacts.org/faq/what-surimi )