I guess independent charging stations can have support for every car interface, but that still feels like a waste compared to a universal interface.
There are four standards, although only three per market. And, in essence, there are two surviving standards per market.
1. Tesla US connector 2. Tesla Everywhere else connectors (CCS with a mod to allow DC charging over it) 3. CHAdeMO (used to be the thing, but lost the war) 4. CCS-2 (European standard, what most new cars, except Tesla, support)
The rumour is that the EU Model 3 _will_ have a CCS-2 port, which would be great news, as that means essentially one standard in Europe. The S/X though have an older port which will only work with Tesla SuperChargers, the hope is that there will be a CCS-2 adapter made available, but that is only a hope, not even a rumour.
In the US, all Teslas have the "Tesla socket", and all/most other cars have CCS(-2).
A few manufactures still make CHAdeMO cars, but, IMO, they _will_ stop soon, since the infrastructure just isn't there to support them, so people will also soon stop buying them.
https://electrek.co/2018/11/14/tesla-model-3-ccs-2-plug-euro...
This isn't a rumour anymore btw, it's confirmed