What do people put at a place like McDonald's or WalMart? Typically there are no signs saying "customers only", but it'd be strange to park there and walk somewhere. Same for a church, except I've lived in some places where the church parking lot was used by the people using a nearby bus stop.
OpenStreetMap community
Everything #OpenStreetMap related is welcome: software releases, showing of your work, questions about how to tag something, as long as it has to do with OpenStreetMap or OpenStreetMap-related software.
OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
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https://mapcomplete.org is an easy-to-use website to view, edit and add points (such as shops, restaurants and others)
https://learnosm.org/en/ has a lot of information for beginners too.
one of the bottom two. Sounds like commercial lot parking?
I think some of the spots are also free for anyone? If all three are true, each with a subset of the spots, my gut reaction is to select 'open to anyone'
Unless you know for sure I'd default to the safe option (only people with permission).
Just cause it really suck to follow osm then get your towed/ticketed or anything, and you don't want to muck up the dataset
If you don't know for sure, answer "can't say". A tag shouldn't be present if its proper value is unknown.
After 11 months consideration and more experience with osm myself, I gotta agree - even defaulting 'safe' is mucking up the dataset in this case