I can't speak for every person's experience, but what I believe is that most dishwashers being sold today, anywhere, are capable of being connected to domestic hot water, or cold water. They will work with both. That's not the same thing as saying every dishwasher being sold can do this, but check your instruction manual. Perhaps it can. As per a sibling comment, decide holistically if that would be a good idea or not.

Unless someone can point me to the existence of regulations saying something like "it's illegal to connect a dishwasher to a hot water line, it's gotta be cold water that the dishwasher heats up itself", then my expectation is that most dishwashers can be connected to either hot or cold, and will heat the water to the correct temperature.

Looking at EU regulations, as far as I can see, they don't regulate the intake temperatures that dishwashers have to accept. What they do regulate is energy usage labelling, and mandating there must be an "eco" mode, what the eco mode must do, and if you get to select multiple modes then "eco" mode must be the default. https://commission.europa.eu/energy-climate-change-environme...