Not necessarily. The price changes are in percentage and the commission are on percentage. With low capital, the money you make might be low but it would be similar to what large trader are earning by percentage. Saying so, there a limit you could go low. I'd say you need to have $100 at least to start trading with one coin. Anything below that set aside for a coin and you can't play with the price change. Trading involves active or automated buying and selling.
If you have a $100 and a coin you believe in, jump in, specially on dips like at current time.
There are other plenty ways one can learn trading without not using money but impatient and quick money syndrome has made many people not look into such way and that is the oldest and safest way of trading. Demo trading it's, it gives you one of the best way to becomes a perfect trader, you can make it work like it's your real account where you can absolutely trade with demo account in relation to what you think you will use later in real life.
You can set your capital to $10, $100 or even $100k and be serious about it. You will learn the mistakes you will learn in real trading and also the profit you can make in real trading and you can make corrections from there but you can't do such while using your money because you will not have the capital to try another chance again but with demo, you can do it over and over again even if your trading capital is finished or at lost, you can request for new faucet and start over again.