Man of Honour
I thought we were in a free country with free speech? And a shining beacon of democracy.
None of this prevents you from speaking freely but you need to avoid the misapprehension that freedom of speech is also freedom from consequence. We've never had absolute freedom of speech and nowhere that I know of has complete freedom from consequences with their idea of free speech. It's also not necessarily undemocratic either.
As far as I can tell they're collecting lots of data but looking for quite specific trigger points so the vast majority of the data can, and will, be ignored. If you wanted to argue that the method is disproportionate to the result then you might potentially have a case but some level of monitoring is to be expected.