For people worried that subscription FSD is too low. There is a long, long, long term plan here perhaps.
For people who regularly drive themselves to work and back, and at weekends, the $99 sounds reasonable, as its making something they perhaps find boring much less tiring and easier.
Fast forward two years
Now all those people are so used to using FSD in their daily commute, that they can't imagine not having it. They wouldnt buy a car without it, and would not unsubscribe unless desperate to save money. The price doubles, but people are so used to it, they grumble and pay
Fast forward five years
Kids are not bothering the expense and cost of learning t drive, because FSD is a thing, so why bother? Meanwhile everyone over 60 has already got used to a world where its not safe for anyone over 60 to manually control a car. FSD is so reliable you wouldn't waste money on a car with a steering wheel except for retro reasons. Price quadruples, but what are you seriously going to do?