In the wild, they get to be free until the day they are killed by a predator.
In captivity they are treated cruelly, fattened, and slaughtered with no chance of escape. How is that a "plus side"?
The alternative lifestyle for them is not frolicking on a green grass, but non-existence. We are the cause that they exists. They don't know about "no chance of escape", you do. I'm all for labgrown meat, but mixing your own feelings and objective information about their assessment of quality of their own life (which you don't have) is not helping your cause.
Feelings are there for a reason, mate. Mine tell me that an animal would rather not exist than being born into a life of torture followed by slaughter.
So a next step should be redesigning biosphere to eliminate suffering or eliminating all sufficiently intelligent animals. Their life is a struggle for survival followed by death, after all.