I think I posted this reply in the wrong forum, but here's my hypothesis:
1) Elon and Tesla aren't dumb, they know that good charging networks are highly critical to high levels of EV adoption.
2) They got almost all NA market to adopt NACS while in Europe they followed existing standards that were getting traction eg CCS.
3) They know that it's a team game (with all EV manufacturers) now to get the supercharger network built out (whether in NA with NACS or in other places in the world with CCS or whatever standards become most popular.
4) Supercharging network is a commodity, and a capital and resource intensive business (high capex to build, ongoing maintenance costs to maintain and deploy, dealing with local regulators for permits, etc). Tesla prefers higher margin businesses and ones with greater competitive moat and differentiation (eg FSD, robotaxi, robotics or hardware businesses with a better moat - eg cars, batteries, energy, etc). Heck in the beginning they said they would operate the Supercharger network at break even and not try to make money off it so they clearly initially viewed the supercharger network as a means to enable people to actually buy and use the cars, but not as a strategic source of profit (because in the long run there isn't much profit because they have to buy the energy from a local utility).
5) So they decide to build the hardware and license it (like recent deals they've done with BP and EG) and let other people build out the boring, low margin, capital intensive business that now every car manufacturer that wants to sell EVs is reliant on. Yes they may be walking away from some profit if they were to eventually try to operate charging as a profitable business (especially to non Tesla EVs) but the truth is these margins weren't durable since electricity is a commodity so charging costs should be very much in line with underlying costs.
6) Maybe they continue to build a few locations where needed, or some of the "flagship" locations that are fun/brand halo like the drive in diner, but the boring old regular "gas stations" they lean on others to finish the job they started because there isn't much interesting business in building out the next generation of "gas stations".
7) I wonder if a weird side effect of this is that free supercharging is only available at Tesla operated supercharges and as the network gets built out to maturity by a boatload of other companies, Tesla's liabilities tied to costs of free supercharging go down as more charging gets done at third party operated charging stations which don't honor FUSC.