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I don't know what >1M subscribers have got to do anything. It is the case that many YouTubers pushing a specific propaganda have >1M subscribers. YouTube may be a little better than Twitter or Facebook but if you land upon any propaganda, the algorithm will loop you in and keep supplying more and more propaganda videos. 1M subscribers or 1000 subscribers doesn't matter once you are stuck in the loop.

I see you have not been around in London for over 10 years. How was it back when you were in London? I've been in London for 10 years, so I probably came when you left. Never once I have been in any part of London where English was not the lingua franca. Yes, people speak their native languages too among themselves but I haven't met anyone anywhere in my 10 years who couldn't speak English. I don't think this is any different from any other megacity of the world.