You might not but you should. If you don't care about the welfare of your cows they will not grow as large and you'll have less product to sell. Putting that

You might not but you should. If you don't care about the welfare of your cows they will not grow as large and you'll have less product to sell. Putting that in more literal terms, if you damage the user experience you will damage user engagement and your ad revenue is going to fall. There's certainly tricks to treat the cows poorly and still profit for a while but this sort of behavior has killed many companies.