Then use free software and make regular donations to the developer, rather than paying someone to deny you the software freedoms to A. audit the code you run B.

Then use free software and make regular donations to the developer, rather than paying someone to deny you the software freedoms to A. audit the code you run B. make modifications you want, either yourself or through the services of third party developers and C. have options if the lights go out, where you can then pay someone else to maintain critical software for you. Putting all your eggs in one basket is generally considered a bad business model, and the same easily applies to software. Free software does not need to just be ethical to be useful, it is also highly pragmatic.