(a) that is not true (at least not all data) and (b) the LWG have not said that,.as I said previously here.
A flippant answer might be “rouse yourself from behind your computer keyboard and start surveying”?
More seriously - there will always be different sources of different quality data available. We know that if you do random scraping you end up with data of questionable quality. See this earlier thread for chapter and verse on that.
To see what corporates have available to contribute, see for example here. Selecting 75% confidence and looking at the two data releases there shows that it is getting better (they’ve noted that “Max Car Care Limited” does not operate from the north transept of York Minster, but still the majority of the POIs shown there are “obviously wrong” in some way, even in the latest data release.
If there genuinely is no local surveyed data, then consumers have no choice but to go with whatever other people might have guessed at, but much of that will be wrong - it’s just quite literally “better than nothing”.
Hence my flippant answer above 