Yeah, as long as the payment method is FOSS, secure, and works as intended, I have no serious issue with pay-once software being introduced. There are apps from F-Droid I would pay a few dollars to use if required, and I'd be happy if it meant more and higher-quality software.

I feel like the freemium model they mention with subscriptions is just begging for F-Droid to be enshittified. F-Droid would really, really need to prove themselves with pay-once applications first for my liking before moving onto something so much more drastic.

And then ads are just a non-starter. Ads only exist to be psychologically manipulative, they're obnoxious as fuck in the present day, they're a privacy nightmare, and they're a vector for malware. I would see it as a betrayal of what F-Droid does for me, and I would actively see F-Droid as being sellouts who are only marginally better than using Aurora at that point.

If they were talking about Privacy-Preserving Attribution like Firefox is experimenting with supporting on MDN, that would be one thing, but it doesn't sound like that's what F-Droid is talking about.

Not only are privacy and data protection founding principles for both Mobifree and F-Droid, the use of tracking-based in-app advertising poses a moral dilemma as well. If someone wants to gain access to an app, but does not have the financial means to purchase it, they can use it at a different kind of price - their user data.

F-Droid is also considering ads that contain no tracking, which removes that moral dillema, IMO:

It should be mentioned that it is possible to include in-app advertising without user tracking. However the lead conversion ratio drops dramatically, so the efficacy of this approach is not nearly as high.

That's basically what PPA is, advertising without tracking. If advertisers want to pay for it, then great.

Edit: Downvoting without responding like

Did you read the linked article?