Ann: Continued Use of ResAppDx at COVID-19 Respiratory Clinic, page-29

To have the app in a hospital and working is far more persuasive than words. The actual dollar cost to RAP is practically zero, Its automated, and, it adds to the portfolio of successful users. This is our (seen to be objective) salesman, who is also producing a paper on how good it is. .........very cheap, and very credible advertising

As for the long term on this site, they might have been reluctant to buy it when first offered. Now that they have had the use of it and are enjoying its diagnostic and confirmatory benefits it will be much harder to give it up when the free period comes to an end.