Thanks for the interest @gamesfi.org 
They need to be part of our telegram group and use commands of our bot Tron Community Energy Bot 🤖. The dApp will simply have a button (Pay with points) if the address is whitelisted in any of the telegram bot users - we plan to have both energy and bandwidth covered in this case.
The swap router of the free swaps will be deployed by the main address of the bot and will have 100% fee paid by that specific address.
We detailed above we basically check the on-Chain contract and we check how much of the fees is covered by the contract and how much is covered by the user. And we swap as their interface does that. Remember blockchain is free and usable by all users so anyone can use your contract if no restriction is applied.