The existence of an app brings users value, else they wouldn't use it.
and I doubt these apps are really Free versions - do they support user modifications and access to the code? If they did support the four freedoms maybe the fsf would have something positive to say to balance it out?
I pay for some software services. The services I pay for have a billing page (or a donation page) and I pay via the banking system
I rigorously block every ad, every tracker, every thing that does "monetization"
The evil period of trying sneaky ways to generate money is, I am optimistic, coming to an end.
If you want my money, ask me. If you must have my money, demand it. If you are sneaking around "monetization" I will do everything I can to stop you.
You got a genuinely free, to you, app.