> And London being the only city in the top 10 for surveillance outside of China.
https://www.comparitech.com/vpn-privacy/the-worlds-most-surv....
While I've no doubt that London is highly surveilled, that data is, to put it bluntly, horse droppings, and should never be cited.
If you look at the sources they cite for stats like "There are 2,985,984 cameras in Shanghai" (Wow, look at the precision on those figures! Six decimal points, if we express it in scientific notation!), you will find that they take a random unsourced number from a blog post from 2013, then add 20% to it 6 times over, because they assume (Also unsourced) 20% year-over-year growth.
Meanwhile, that same source claims that there are only 3,600 cameras in San Diego. As anyone who's ever been in a convenience store, bank, airport, or workplace can tell you, that's complete baloney. You can probably visit enough businesses in a normal day that will have you walk past 3,600 cameras. (And the source for that number? A news article about the city government installing 3,000 new intersection cameras. Apparently we are to believe that across all the businesses, government buildings, and private residences of San Diego, there are only 600 cameras.)
I'm not sure if the authors in question are just incredibly stupid, or incredibly intellectually dishonest... But my money is on the latter.
tl;dr - please think critically about your sources, especially when they reinforce a pre-conception that you hold. Most of the 'data' you can find on the internet is garbage.