You're right but sometimes they might also want to diversify which is by going into crypto investment, and still continue with thier trading. And of course this is how must traders do, so that should incase they experience lose in trading Maybe they can be able to recover it through thier long term investment. I have an idea about a trader who have been making use of this method, And of course as a trader is very good to diversify since we don't have a guarantee about the outcome.

because losing can occur at anytime, And if you're this set of traders who always expect profit all the time definitely you will be so disappointed because that's where your hope lies. which is why as a trader is very essential to look into investment while trading so that you can be able to minimize most of the loses you will experience in trading, That's for those folks who have decided not to quit from trading regardless to their loses, but I think going with this method will help them to minimize  thier loses.