Why not? This amount is enough to learn how to use Bitcoin at least in wallets. Learn how to create transactions and move your Satoshi. And a little later, you can systematically replenish your wallet and continue to make savings, and in a year or two the result will pleasantly surprise you, I have no doubts about this.
If you use it to learn how to use bitcoin then I think it's a perfect fit. But for only $30, and you expect the unexpected to happen in 2 years is the paranoia that I will tell you that will never happen. Even if you keep it for 10 years or more, $30 is just a small amount, and you can't expect to get rich with such a small amount.
you probably didn’t understand what I wrote. I wrote further that he needs to replenish his wallet further and not continue to keep the same amount. It’s also clear that if you have only $ 30, then in two years his balance will not grow much .Therefore, you need to replenish by more significant amounts, if possible, in order to increase your capital.