Who said no one is going to maintain it and why aren’t you applying the same standard for everything else? Like what did you say in another discussion a few days ago “it might be a solution to use something like bus:<network name>=yes to indicate the parking area.” I didn’t see you capitulating in that conversation about how there there’s no benefit to adding the names of bus networks to OpenStreetMap when no one is going to maintain them or whatever. So what’s so special about addresses compared to other types of data that you apparently zero issue with people adding?
Why not use it directly in whatever service (I assume Nominatim) you want to have it?
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I could be wrong, but the last time I checked people can’t add addresses or anything else, directly to Nominatim. I’m totally to look into that if you want to point me in the direction of how and where they can, but I don’t think if that’s an even option it necessarily means address shouldn’t be added to OpenStreetMap regardless. They aren’t mutually exclusive.