The short reply is, if you dont like google and their terms of service, dont use it! Its a little unfair to use someone's service and then call them villain if you did not read or like the fine print.

The primary issue with wikimapia is that google derived data is mixed with direct user contributions that are copyright free. Because there is no way to separate the two, the whole database is a mess of free and non free data of varying accuracy.

Coordinates based on google maps has already made its way into wikipedia articles thanks to the geocoding tool[1]. There is now no way to check for accuracy or authenticity of this data. What was the source of these coordinates? A field survey or user knowledge,  or blatant copying from a copyright map? One will never know, nor is there anyway to easily fix the mess.

[1] http://tools.freeside.sk/geolocator/geolocator.html