But they have no walled garden...

They should by now have some kind of platooning feature where you press a button and it'll hook up to the Tesla car ahead of you for long distance journeys.

Or a 'tesla miles club', where driving 100k miles gets you perks like free insurance, theme park tickets etc.

Or something like 'free parking when you park with a friend who also has a tesla'.

Basically Tesla needs the equivalent of the iMessage blue bubble lock in effect and the 'all my stuff is on iCloud it would be too hard to move to android' effect.