HAVANA — For Yasser González, a software developer who now makes his living as a bike tour guide in Havana, the onset of American tourism has been akin to a second Cuban revolution.

For a nine-hour tour marketed by Airbnb, Mr. González, 31, can pull down as much as $700, a princely sum in a country where the average state salary is just a little over $20 a month.

“The majority of my clients are American,” he said. “With Airbnb, I have become independent. I market and sell my own product that I have total control over.”

Such entrepreneurial dreams were precisely the sort of change that the United States government had in mind when President Barack Obama formally opened relations with the communist nation.