I am surprised by how infrequently they seem to be used outside of the U.K. - I’ve just rewired my house in Portugal as it was completely unearthed, and just had fuses, no RCDs.
A typical lathe, mill, plasmacutter or welder (which that particular workshop was full of) would be in the 10KW range with peaks far in excess of that during start-up.
I don't remember if we had the office area (where I was working) on protected circuitry or not, that would have been an interesting bit of data. The building still exists, I'm almost tempted to go and have a look.
That HV supply was a pretty beefy one by the way, the crocodile clamp that made 'first contact' was gone entirely.
Norway also just switched to smart meters, which can detect ground problems as well, and supposedly a lot of issues has already been prevented by these being automatically reported. I suppose this is something which is more likely to spread to other countries, as it's not just a safety thing, but also an upgrade that makes your life more convenient, and saves the utilities money in the long term.
Not sure if that's a national requirement or not, but houses I've lived in in Victoria also had RCDs.