There is little political will to regulate printer cartridges.

Cars on the other hand are heavily regulated.

The oil industry, I can assure you, would be quick to lobby for little standardization and regulation on hydrogen exactly for the reason they they want it to be in the same sorry state as printer ink

Don't you see even Tesla Supercharger is opening for all EVs? It won't work.

Yet those measures are being circumvented, because physically you can fill the cartridge, and legally, because this physical ability requires the manufacturer to take intrusive measures which are blocked by courts/legislators.

It's hard to force the consumer to not use their product. Conversely, it's hard to force the operator of a fast charger networks to do something. We can see other BEV manufacturer following Tesla's method (e.g. Rivian) setting up their own charger network. It's not a desirable future for such important market like transportation.