There’s a second open standard as well, primarily in Europe, CCS2, but both are now compatible with each other aside from the actual heads of the plugs, which can be solved with an adapter, no software needed.
You’re right overall though, Tesla’s now-open standard is expected to be the new standard in the US, and CCS2 in Europe, so it’s a very safe investment, because this new standard will be compatible with its competitor, too, with an adapter to use Tesla chargers.
Overall a huge win for electric cars, if the only thing stopping interoperability is a hat, and also a very good investment for any auto company, for the same reason.