Love it or hate it, Tesla has been responsible for helping to shape the tastes of automotive consumers over the past decade-plus. Over-the-air updates that add more features, an all-touchscreen human-machine interface, large castings, and hands-free driver assists were all introduced or popularized by Tesla’s electric vehicles, prompting other automakers to copy them, mostly in the hopes of seeing the same stratospheric gains in their stock prices. But starting on Valentine’s Day, if you want your new Tesla to steer itself, you’ll have to pay a $99 monthly subscription fee.
Tesla currently offers a pair of so-called “level 2” partially automated driver assist systems. Autopilot is the older of these, combining Tesla’s adaptive cruise control (Tesla calls this TACC) and lane-keeping assist (Tesla calls this Autosteer). FSD is the newer system, meant to be more capable and for use on surface streets and divided-lane highways. Although the company and Tesla CEO Elon Musk regularly tout these systems’ capabilities, both still require the human driver to provide situational awareness.
But Autopilot has been under fire from regulators and the courts. Multiple wrongful death lawsuits are in the works, and after a high-profile loss resulting in a $329 million judgment against Tesla, expect many of these suits to be settled. Both the federal government and California have investigated whether Tesla misled customers, and in December, an administrative law judge ruled that Tesla indeed engaged in deceptive marketing by implying that its cars could drive themselves. The judge suspended Tesla’s license to sell cars in California, a decision that the California Department of Motor Vehicles stayed for 60 days.

This isn't about raising money from subscription fees. This is about juicing the Q1 sales numbers.
Last year Tesla got an example of what consumers do when they know a benefit is ending. They reversed their steady downward trend in sales in Q3 because people wanted to buy before the tax credits went away.
(emphasis mine)
If I had any interest in getting a Tesla with FSD, hearing that it was going from a one-time fee to a subscription model next month might get me off the fence about buying one.
If the response is strong enough, well that's justification to beneficently delay the switch to
trigger more people's FOMOrespond to customer demand. If not, well shifting to a SaaS model will still set up a revenue stream. I'm not saying it will work, but I can easily see that as the impetus behind this move.Remeber: Elon is at heart a con man. This seems like an obvious play.