Another point is that the large portion of the user’s data is confidential, thus some sorts of promotion are impossible to use — like product recommendations, bundling and personalization algorithms as well as target future promotions.
Most providers offer hourly rentals starting from as low as 37 sun per energy unit, making it ideal for both individual users and DApps requiring consistent energy supply.
Currently, the scenario that uses the most energy on TRON is USDT transfer.