Yeah, I agree with that. I was just trying to point out how Nintendo’s BC has never been as complete as it could be, for whatever reason it may be, but yeah, they’ve been pretty good at guaranteeing last-gen compatibility so far. Let’s see how it goes with whatever will succeed the Switch.
TL;DR: F-Droid isn’t referring to that, but yes, the app requires an API key for a paid service to perform unlimited requests.
Long answer:
When using the expression “non-free”, F-Droid refers to something not being free software, where the term “free” doesn’t refer to its price (free as in beer), but to it giving its users freedom to do what they want to with it (free as in speech).
However, this application in particular relies on a service called AudD, which is a paid service based on the number of API requests done. So while the F-Droid “anti-feature” list doesn’t refer to its price, this app still relies on a paid service and requires an API key upon launch (although it seems you can do a limited number of requests without one).