There were probably 10s of thousands of spies from different countries already living there. They just added to the numbers that’s all. Just like I’m sure there are American spies living all around the World. About 20 years ago when I did my MBA I worked closely with another person around my age in late 30s, early 40s. I worked with this really nice person who was originally in the Federal police and coincidentally si was her husband. (Not sure if they met there) anyway they then became spies for ASIO and were sent to Malaysia with some made up story; I can’t recall the details. But because of the fake positions, they were able to mix with wealthy business people and of course Gov people. She said she woke up shit scared every morning thinking their cover would be blown and she’d be caught. So yes there are doors out there living amongst us and also with their enemies. I’d be very surprised if Govs haven’t worked out who the spies are and keep an eye on them unless you’re Swalwell and you just sleep with the spies.