When I say profitable, I'm assuming someone factored in antitrust risk (an all-time low given our current policies here in the US, mind you), as well as the lost customer satisfaction, possibly revenue from users of those other browsers, etc. weighed across the cost of man-hours to support other browsers. Obviously, Google supports iOS quite well, because that platform brings with it a massive amount of users, and hence a massive amount of money.

And FWIW, I recognize that the engineers are usually not the same as the businesspeople who make the business decisions. :)