Crypto exchanges can make deal with businesses for discounts and rewards on making crypto transactions. While this will bring in more funds for the exchanges, which can further be invested. The businesses will also benefit due to lowered financial costs.
building and providing payment facilities using it is very good in my opinion, because there will be visitors who will pay with crypto later. especially nowadays, many people have started to adopt bitcoin and of course they can save the cost of exchanging it with fiat and can be exchanged directly in crypto without having to wait in line.