Selling your crypto means taking the profit of it. Thats how it works to earn easily without the risk.
I don't agree that it is without risk. There is already a risk at the time someone bought crypto. It gives a false impression to it. You should highlighted that people should invest what they are willing to lose rather than giving a false hope that it is that easy to leverage is a better advice.
With regards to the computation, it is too simplistic. I agree that it how you get somehow what it intend to be, but you missed that there are gas fees to it. it is not that simple at it seems. It good to know that you are earning. Hence it is a basics guide to crypto (as what you have said); you only pointed out one extreme, which is when the market goes up, but how about it goes down?
By the way, the apple analogy is flawed. I agree with @themanualbot's comment. Risk is always associated to investment. Again, pointing out that someone should invest what he or she should willing to lose.
On a side note, you should be posting on Leofiance since you are posting blogging about crypto and trading. It will give you some leverage for your content.
Lack of research for those who saying its risky. Generalize those term, its Network fee not just Gas fee. Once again Risk is manageable. Risk is for the people who's afraid to change their life. Either for better or worst life must change.