I also wonder if the story about the restaurant clients needing to change table is true tho. In theory, sure, but come on. Do you really expect police to come in with a map of the border and enforce the fact that clients should not be sitting at table #4 but table #5 is ok? That seems a little ridiculous too.
Also, does that imply that business on the border have to be incorporated in both countries? If not, does the Belgian business have to comply to Dutch laws since it's in part physically located in the Netherlands? In that case, is it really only subject for what's physically in the Netherlands? What if the kitchen is on Belgium side, The Netherlands are not allows to do proper health and safety inspection?
As I write this I realise that it brings a lot of interesting questions and everything must be very complicated over there!