have a look at https://mapcomplete.org/trees - you can add pictures and it has plantnet.org integrated to recognize tree species automatically
Oh, yeah, no it isn't open data. This type of data is very hard to build in an open data way: people don't like to contribute privatey data and they will only use such a system if it is big enough...
No, definitively not it. It shows the sphere and even some city names, but just no background map:
It rather is that Mapbox doesn't trus my browser and gives me a "forbidden": 
Guess firefox isn't corporate enough for them!
Why does it not load tiles on Firefox nor Librewolf?
(Mostly) unrelated to OsmAnd: with https://mapcomplete.org/nature, you can also see firepits and add firepits to the map (and even include a picture). If you add a firepit with this, it'll appear (eventually) in OsmAnd too
I disagree. They both serve a different part of the market. OsmAnd is a heavy tool with thousands of features, Organic Maps is a lightweight tool for more general users. Both approaches have (dis)advantages.
No, it is not. OSM is a database of geodata. The rules are clear: what is in there, must be (semi)permanent and observable. A fire staircase meets those requirements.
If you (or a dataconsumer) doesn't care about this data, they can simply take a copy and delete from that copy what they don't need.
Don't map for the renderer. If OsmAnd doesn't handle it correctly, complain on their issue tracker.
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Checkout https://mapcomplete.org/trees . It doesn't have fruit trees specifically though