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If really no companies were interested, maybe you would just have added new POIs on OpenStreetMaps and everybody could build on it

I'm not in Taiwan but Japan (not metropolis), here OSM is not enough detailed and not updated well. Is it different in other countries?

Certainly from my experience in the cities of New Zealand its as good as Google maps and in some respects superior. I just assumed it would be like that in Taiwan and so when I read about the Google bill I was thinking "shame they didn't use OSM". Certainly if I were to make a similar project for where I live I would use OSM for it.

They could have used OSM if Google charged standard rates for maps

The sibling replies mentioning Openstreetmap are correct. When displaying placemarkers, like this, you don't need Google Maps.

Also, for showing maps on a high-volume homepage like this, you can use caching, robots.txt and old-school HTML image maps.