Permanent establishment of tech giants in india

arab sahil (8 Points)

18 July 2021  
dear experts,
i just want to know that why the companies like google, facebook, amazon are not considered to have permanent establishment in india, even after they have incorporated their subsidiaries in india like (google india pvt. ltd) ??
and why the concept of significant economic presence in india was necessary to be introduced in india?
please guide.