Typical use case for me: hitting on Google Maps to find addresses via venue names; 99% of the time. I.e. I enter the name of the restaurant etc + some fuzzy data, like part of town or name of the city. This just works.

Last time I checked (just now), this still didn't get me any useful results from OSM for the European capitals I frequent (Rome, Paris, Berlin). I guess it is even worse for smaller cities.

Yes, there is some venue/business data. But it is too sparse, at least for most of Europe, for OSM to be a useful replacement for Google Maps -- even in the medium term.

The question would be: how could this be rapidly improved? For example, I entered probably two dozen places that were missing on Google Maps, in the past. While this data is now Google's, I entered it, originally. What's more, if I would be adding it again, to OSM, I'd certainly enter the same data.

I wonder what the legal perspective would be if everyone crawled "their" data (i.e. the data they personally entered) from Google maps and forwarded it to OSM.