Is car pooling legal for private cars.

BlaBlaCar automatically calculates a recommended price for every journey, ensuring that car owners do not receive reimbursement exceeding running costs. Therefore, private car owners do not require a permit for carpooling in India (as long as the private car owner does not operate for 'hire or reward').

It is a mutual agreement / consent of private car owners to use pooled cars.

However, no legal issue is involved in functioning of Blabla app vis-a-vis your query.