One should always keep in mind while investing that investing only the extra funds that you can afford to lose because the crypto market is highly volatile. We should understand as investor risk calculation is a must in this highly volatile crypto market otherwise it's not easy to survive in this highly volatile market.
That's true, we should invest in free money or extra money.
because as many people said every business have risk.
So, I agree to with OP, always invest that we can afford to lose.
But we should have good analysis and research before invest in crypto currency.
Maybe several of us ever lost at the past.
That's the fact