Over the life on the loan (6 years) you’d pay about $1,500 in interest. If you paid $8/mo it would take 15.6 years to have paid a total of $1,500 in monthly fees.
Likely if you pay $8, you also pay for another subscription. So say $16/mo on average makes $1,500 in only 7.3 years.
Monthly subscriptions may be comparable in revenue to what the dealership earns from financing.
This may be way off, I don’t really know how any of this works but I am currently shopping for a Toyota :)