Sure, like I said there is no way for me to know that after they asked for permission to use GPS when I engaged the "Run" function the first time, they won't spy on my location every time I just use the app (apart from the little GPS activity icon perhaps).

But the context of me switching to the "running" feature and then I'm asked if I want to allow the GPS function is enough for me to not feel watched. It's all about context.

Same if the app asked for permission to see your photos (forever) when you use the custom cover art feature.

For a malicious app this makes no difference, but for those apps we (sort of) trust, the context makes all the difference.