Imagine you created your very first app. You developed the concept, workedtirelessly on the key features, design, tested it and fixed the bugs. Themoment has...
Can I just make a donation? Seriously though I don't see why F-droid needs to offer more than a donation link. If an app wants to put a donate pop up on first launch that's fine but don't turn it into anticonsumer bullshit.
What purpose does ads serve to the end user? Also I don't see any reason why F-droid should be a payment system. They should just allow donation links.
Okay, it's open source, you don't have to use their platform. If they want to introduce some monetization stream for people you don't have to participate. You also don't have to be angry it exists.