No, not at all. There are ways to implement this without making it a requirement to use the app. For example, you implement a counter for each user of the app, so they can only use a subset of the API requests allowed for your application.
Then if they go over their allocated amount of calls, or they have been a user for X days/weeks/months, you give them a guided walkthrough on how to register their own API key.
this, I wanted to make a little utility for getting lyrics for whatever song is currently playing on spotify[1] and ran into the issue for getting the song name without using the API since that's just inconvenient for the end user. The most popular such project does go that way though.[2]
I ended up writing a small library that does that locally cross-platform by using the metadata from the app.[3] The approach is probably not as robust as the API, but much faster and works well.
This seems like such an obvious answer, why isn't it significantly more common?
Because that will also self-select the audience to be really small.
No, not at all. There are ways to implement this without making it a requirement to use the app. For example, you implement a counter for each user of the app, so they can only use a subset of the API requests allowed for your application.
Then if they go over their allocated amount of calls, or they have been a user for X days/weeks/months, you give them a guided walkthrough on how to register their own API key.
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this, I wanted to make a little utility for getting lyrics for whatever song is currently playing on spotify[1] and ran into the issue for getting the song name without using the API since that's just inconvenient for the end user. The most popular such project does go that way though.[2]
I ended up writing a small library that does that locally cross-platform by using the metadata from the app.[3] The approach is probably not as robust as the API, but much faster and works well.
[1] https://github.com/SwagLyrics/SwagLyrics-For-Spotify
[2] https://github.com/johnwmillr/LyricsGenius
[3] https://github.com/SwagLyrics/SwSpotify
The Spotify API doesn't support private API keys, so you need to create your own OAuth App and then authorize it for yourself.