Free Trade and Warehousing Zones in India

The Central Government of India has plans to approve 8 Free Trade and Warehousing Zones(FTWZs) in India of which 4 have already been notified by the Government. 3 FTWZs are already operational. Private investors have invested nearly 3400 crores in these FTWZs till date. The Central Government has made no investments in these CTWZs. What/Why ..