Whose vehicle is it
DERSA does not assume the driver owns the vehicle. All three arrangements work; what differs is how the money is divided.
Your own vehicle
The simplest case.
The registration is in your name, and everything a completed job earns after DERSA's commission is yours. Nothing is split with anybody.
Somebody else's vehicle
A relative's car, a friend's bajaj.
Allowed, and common. DERSA asks for the owner's written consent on file alongside the registration — not to make life difficult, but because a vehicle being driven for money by somebody who is not on the papers is the kind of thing that becomes a problem at exactly the wrong moment.
A fleet's vehicle
No vehicle of your own needed.
You drive a vehicle a fleet owns and the earnings are split with the owner on terms agreed in advance. The split is attached to the assignment rather than to you, so the same person can drive a fleet bajaj on Monday and their own car on Tuesday, and only Monday owes the fleet anything.
The split is not a surprise
When you drive a fleet vehicle, the share you keep is known before you start, and at the end of each job what was recorded for you and what was recorded for the owner are shown separately. Two people's money is never hidden inside one number.
DERSA records what it owes each of you separately. The owner does not collect their share from you — neither of you is the other's debt collector.