Perpetuating and expanding the species is such a basic goal of any living thing that it holds true for the entirety of the Philogenetic tree, with no exceptions, from prokaryotes to plants and vertebrates and humans. In the natural order, existence and proliferation are not just the most important value, but the only value for which an organism exists. Reproduction is often painful and scary, and many living things stop living as soon as they are certain they have successfuly reproduced.

So, by the only universal standard of value among living beings, cows are one of the most successful vertebrates in history - they have managed to breed to almost unprecedented numbers for vertebrates in general, nevermind for mammals.

Even if the only possible way of life for them was the physical suffering of cows in industrial farms, it would not outweighg this basic drive. To suggest that the imagined human concept of 'being exploited' would outweigh the value of existing and breeding is one of the most bizarre takes I've ever heard.

Even humans, who do feel the psychological damages of exploitation and being owned, in the worse conditions of slavery, have never chosen mass extinction over the simple drive of continued life.

Edit: I'd also add that if you value the abstract evil of 'being exploited' as worse than any concrete qualities of the life lead under exploitation, to the extent that non-existence is preferable to this, then you have no choice but to apply this same logic to all agricultural grown plants, especially those that cant even reproduce without our care like bananas or wheat, and to the many kinds of Bacteria we use to produce drugs. They are just as much the victims of exploitation as cows living on nice farms are.