Us, crypto enthusiasts prefer to buy with cryptos I guess ? When I will see a merchant with paypal and UTrust payment options , no doubt, I will use UTrust, especially if they will integrate a lot of cryptos.
About people not involved in crypto, if the merchant is really a crypto enthusiast and want cryptos in general to grow, he can say "look! If you pay trough UTrust you have a 10% discount when you come back next time!" (just a stupid example, just to give the idea). Trust me, people will write "cryptocurrency" on google after 1 second