For the subject, the business model it represents, who is it better for? For the lender of the licenses or for the borrower? Because looking at it from a logical point of view, the advantage should be the lender of the license.
Whoever lends the licenses, I imagine they do it to test how things turn out on their site, the problem is that if the site turns out to be very successful, while paying the license rent, they may not have enough money to process the own licenses for the site, because I would have to make a loan of money and there would already be two debts that I would have to face, but my question is, is the license rental business really profitable? because it is obvious that philanthropists who want to help others grow in this area there are none.
For "lending" I'd say it's more like "sharing".
There are serval reasons why people might consider sharing their license to others.
Maybe it's a start-up casino, a small casino that doesn't make much profit, or a casino that's about to cease their operation.
In such case they might consider sharing their license in exchange for some additional profit.
One side can make extra profit and one side can rid out the hustle of applying for a license, so it's a win win situation.