With an overpass query I get the following results:
highway=service in India : 982 345 roads
highway=service in Rajasthan : 60 293 roads
I checked some results in Rajasthan:
All these roads were mapped by Facebook mappers years ago; in most cases these are roads in rural area from an unclassified road to a single house/farm.
According to the wiki, highway=service is OK here, but service=driveway is missing.
Yes the cases in urban ares are more complicated.