i think Bitcoin is only profitable if done at large scales. you must get expensive mining equipment and of course it consumes a lot of electricity monthly. Also its usually much more cost effective to buy Bitcoins with this money instead of using it to buy mining equipment.
In my own opinion, mining and investing is not the same because they are not the same way of earning cryptocurrency but they are common in the way that you need to have capital. Mining will be only profitable if your area has a low amount of electricity consumption, while investing will give you a huge amount of profit depending on the growth of your coin.