It does seem that attitudes to the media and experts has changed in recent years.
That's likely a confirmation bias - I had little to no awareness of what's happening in certain social bubbles say 10 years ago, yet it is quite hard to not to notice nowadays. It does not necessarily mean it’s a new/emerging trend, it may merely be more noticeable from our (or at least mine) point of view.
I do wonder if some of the 'conspiracy' influencers are working on behalf of such politicians.
Some of them likely do, some of them are genuine conspiracists thouhg. There are books analyzing the Czech conspiracy sphere, but I don't know much about the British or the US ones.
Thanks for your comment, it's almost a post :)