I run an appointment scheduling site that is used by many escape rooms (supersaas) so I have a pretty good overview where they start: The Netherlands is indeed

I run an appointment scheduling site that is used by many escape rooms (supersaas) so I have a pretty good overview where they start: The Netherlands is indeed leading the pack but so far we are seeing many more in Europe than in the US, and almost none in Asia. Conversely, we see that the number of dog training classes in US is 5 times higher than in Europe :-)