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The pianos.pub could be an osm editor that just edits pianos, based on https://wiki.openstreetmap.org/wiki/MapComplete

There's lots of prior art, such as https://wheelmap.org/ -- so I imagine OSM is somewhat open to this sort of thing. Might be worth looking at how Wheelmap edits OSM. I believe it's from a generic account and edits are tagged such to make it clear it's from a member of the public.

You could also implement OAuth (sign-in with OSM) to do edits, similar to how some tools like https://maproulette.org/ work, though you'll get less contributions if you don't have an option for anonymous public edits.

Haven't tried it myself, but there are automated imports going on here and there, and a few wiki pages (including a code of conduct) on the topic too: https://wiki.openstreetmap.org/wiki/Automated_edits