As the network and the number of transactions grows, the fees for those transactions increase. The commission per block mined already ranges from 0.25 to 3 bitcoins (depending on the blockchain load).
"After mining the last block as a reward for their work, miners will receive exactly these commissions, so mining cannot stop being profitable for miners.
In the future, bitcoin network commissions will increase if the cryptocurrency is used everywhere for transnational payments, and the reward per block will gradually fall away.
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