They are spending their own time and money on this project and all of us are benefiting from this. We should be throwing them some support. I encourage everyone to go to Patreon and sign up. At last count I only saw 5 members.
From their Patreon page:
‘ By supporting our team through Patreon, you are helping build the next generation of radio control software. wfview is, and will continue to be, open source software. We hope that you consider supporting our efforts! ’
I don’t know them or work on this project, I am just a very happy user of the application.