Yes, this is a common myth that one often hears when people are trying to demonize dairy....especially to vegetarians. The idea, I guess, is to associate dairy with meat...namely veal.
How is that a myth if this is exactly how 99 % of dairy is produced nowadays?
People do not just want milk, they specifically want 99 c milk. (or whatever a liter of milk costs nowadays)
If you want to start producing "sustainable", "fair" or "compassionate" milk and sell it at 9.99 $ a liter, you will find out how many omnis (including vegetarians) are really interested in that, outside of the Indian tribe of the Bishnois, who have been practicing that for hundreds of years.
Best regards,
Andy