I am not endorsing any service or product mentioned above, nor am I providing any affiliate links. Any mentioned company, service or product is mentioned exclusively for illustrative purposes and readers are encouraged to do their own research. Also, this website is administered by myself and hosting costs are exclusively funded out of my own pocket.
Define and write down the conditions under which you'll enter a position. "Buy during uptrend" isn't specific enough. Something like this is much more specific and also testable: "Buy when price breaks above the upper trendline of a triangle pattern, where the triangle was preceded by an uptrend (at least one higher swing high and higher swing low before the triangle formed) on the two-minute chart in the first two hours of the trading day."
The exchange also earns from selling market data generated on its platform - like real-time data, historical data, summary data, and reference data – which is vital for equity research and other uses. Many exchanges will also sell technology products, like a trading terminal and dedicated network connection to the exchange, to the interested parties for a suitable fee.
Some countries also tax money that is sitting in exchanges under the form of cryptocurrency. The USA tax this as « investment money », i.e. at the price level that it cost you to invest. Example: 5% investment tax. You invested 350 EUR in cryptocurrency. Regardless of its value now (whether 1 EUR or 150000 EUR), you pay 5% on the invested 350 EUR. However when you cash out you will have to declare this as financial income.